Fictional planets of the Solar System
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The fictional portrayal of our Solar System has often included planets, moons, and other celestial objects which do not actually exist in reality. Some of these objects were, at one time, seriously considered as hypothetical planets which were either thought to have been observed, or were hypothesized in order to explain certain celestial phenomena. Often such objects continued to be used in literature long after the hypotheses upon which they were based had been abandoned.
Other non-existent Solar System objects used in fiction have been proposed or hypothesized by persons with no scientific standing, while yet others are purely fictional and were never intended as serious hypotheses about the structure of the Solar System.
Vulcan was a hypothetical planet supposed to revolve around the Sun inside the orbit of Mercury, invoked to explain certain irregularities in Mercury's orbit. The planet was proposed as a hypothesis in 1859, and abandoned not later than 1915.
- Vulcan's Workshop (Astounding Stories, June 1932), short story by Harl Vincent: a penal colony is located on Vulcan.
- At the Center of Gravity (Astounding Stories, June 1936), short story by Ross Rocklynne: two individuals are trapped inside a hollow Vulcan.
- Mission to Mercury (1965), science fiction novel by Hugh Walters. During the return of the first manned flight to Mercury, a crew member notices a dark spot moving across the Sun. Since the spot is between them and the Sun and appears to be moving to the naked eye, it can only be the previously-hypothetical Vulcan; it must be moving rapidly and extremely close to the Sun.
- The Power of the Daleks (1966), serial in the Doctor Who TV series. Set on an Earth colony on Vulcan in the early 21st century, a world covered with swamps. Vulcan appears to be one of Earth's first colonies, set up by 2020 AD according to publicity, but it is unclear if it is in a nearby solar system, or if Vulcan is in the Solar System. Script directions refer to 'the Plutovian night', suggesting that the story was originally set on Pluto, or that Vulcan was in a similar orbit to Pluto, at the edge of the solar system.
The name "Vulcan" has been used for various other fictional planets, in and out of the Solar System, that do not correspond to the hypothetical planet Vulcan. The planet Vulcan in the Star Trek franchise, for instance, is specified as orbiting 40 Eridani A.
Counter-Earth was a hypothetical planet sharing an orbit with Earth, but on the opposite side of the Sun (and hence always invisible from Earth). The idea of a counter-Earth has never been a serious scientific hypothesis in modern times.
- Korad by F. Mond: A Counter-Earth planet inhabited by an advanced alien race that has (mis)guided humankind through several turning points in history by mistake, miscalculation and underestimation of humankind's ability to see meaning where there isn't any. The planet is used in the Korad trilogy of Science Fiction-comedy books by Cuban writer Felix Móndejar (pen name F. Mond).
- Planetoid 127 (1929) by Edgar Wallace: A short novel of communication by radio with another world on the other side of the sun in Earth's orbit.
- Aboard a Flying Saucer by Truman Bethurum (1954), tells the story of Bethurum's meeting with aliens from a planet called Clarion, hidden behind the sun as a result of its orbit.
- Antigeos series of novels including The Other Side of the Sun (1950), The Other Half of the Planet (1952) and Down to Earth (1954) by Paul Capon (also serialised on radio by the BBC): Set on the counter-Earth Antigeos.
- La Dixième Planète (1954) by C. H. Badet
- La Planète ignorée (1963) by René Guillot
- Aïo, terre invisible (1973) by Christian Grenier
- The Illuminatus! Trilogy (1975) by Robert Shea and Robert Anton Wilson: The leaders of the Illuminati may have originated on a counter-Earth named Vulcan and come to Earth on flying saucers from Mars via Saturn.
- The X12 series of books (1975–1980) by Olof Möller prominently features a counter-Earth called Anti-Tellus.
- Les Cités obscures (1983-), graphic novel series by François Schuiten and Benoît Peeters: stories set in a group of city-states on a counter-Earth.
- Twin Earths (1952–1963), comic strip by Alden McWilliams (art 1952-63, story 1957-63) and Oskar Lebeck (story 1952-57). The counter-Earth Terra orbits opposite Earth. The daily strip featured Vana, a Terran spy living on Earth to keep tabs on our technology, and Garry Verth, an FBI agent. In the Sunday strip, a young Texan named Punch explored Terra with its young prince Torro. This strip mostly consisted of travelogue-like views of Terran life, for example the fact that in their liberated society, women, who constituted 92% of the population, ran things.
- Judge Dredd (1977-), comic strip in the 2000 AD comic: Hestia is a planet which orbits the Sun at nearly the same distance as the Earth but at such an angle to the ecliptic plane that it was not discovered until 2009. It is inhabited by a small colony of humans and an intelligent indigenous population who keep their distance from the colonists. The planet is also home of the lethal Dune Sharks (flying shark-like predators which can burrow beneath the ground).
- New Krypton (2008–2009) and Superman: World of New Krypton story arcs in the DC Comics Superman series: New Krypton is a counter-Earth created by Kryptonian scientists using Brainiac’s technology.
- Terra Nova (1960-1966) In the Danish weekly comic 'Willy på eventyr', a continuation of the British 'Rob the Rover', Willy and his crew of spaceship SM-4 journeys to the counter-earth Terra Nova, home of several civilisations.
- Non Sequitur (2009) Jeffrey's alien friend Lars is from Mars 3.5 which is visited by Jeffrey and Danae, and it is indicated that Captain Eddie has paid a visit to this planet as well. 
Television & radio 
- The Adventures of Superman radio series, episode 1 (debuting February 12, 1940): the planet Krypton is said to be "situated on the other side of the Sun" from the Earth.
- The 2000 Plus episode “Worlds Apart” (broadcast 1950-11-15) involves a planet “exactly opposite the Earth, on the other side of the sun” (but, inexplicably, slightly closer) named Vesta (not to be confused with the real asteroid by that name).
- Beyond the Sun/The Hidden Planet, a scripted but unfilmed early story for Doctor Who, was set on a counter-Earth that was almost an exact duplicate of Earth. This idea was reused in the original series (1966) as Mondas, the original home of the Cybermen.
- Sport Billy, 1979 television cartoon: the eponymous hero is from the counter-Earth Olympus, populated by athletic god-like beings.
- Dinosaucers, 1987 television cartoon: premised on intelligent dinosaurs coming to Earth from a counter-Earth called Reptilon.
- Lexx, television series (1997–2002): The twin planets Fire and Water are on the opposite side of the Sun from Earth.
- Spider-Man Unlimited, 1999 animated series: Spider-Man tries to rescue John Jameson on a counter-Earth.
- Warning from Space or Mysterious Satellite (宇宙人東京に現わる Uchûjin Tokyo ni arawaru , Spacemen Appear in Tokyo), 1956 science fiction tokusatsu film by Daiei. "Planet 'R'" is on a collision course with Earth. One-eyed, starfish-shaped aliens from the counter-Earth Paira take on human forms to warn the earth about the impending disaster.
- Gamera vs. Guiron, 1969 tokusatsu kaiju film: Gamera travels to the counter-Earth Terra in order to save a pair of kidnapped children.
- Doppelgänger, 1969 film by Gerry Anderson. Counter-Earth is identical to Earth in every respect except that left and right are reversed. Marketed in the US as Journey to the Far Side of the Sun.
- The Stranger, 1973 film. Terra, the film's counter-Earth, is culturally and evolutionarily identical to Earth in nearly every respect; the most obvious differences are Terra's three moons and the fact that everyone is left handed. However, it appears to have diverged significantly from Earth sometime in the last century or two. An astronaut from Earth crashes there, and discovers a strange dictatorship known as the Perfect Order. Technology is about the same, although geared for such purposes as monitoring of the population to assure adherence to the Order
- Another Earth, a 2011 film written by and starring Brit Marling about the discovery of an identical Earth.
- Melancholia, also a 2011 film, also feature a plot in which a planet emerges from behind the Sun and approaches Earth. It was written and directed by Lars von Trier.
- Mage: The Ascension (1993), role-playing game: A planetoid called Autochthonia exists in the counter-Earth position in the game's cosmology. This is the location of The Computer which is central to Iteration X, the cybernetic convention of mages.
- Sailor Moon musicals (1993–2005): A planet called Vulcan along with its moon, Astarte is said to be on the other side of the sun.
Phaëton is a name given to a supposed planet existing in the past between the orbits of Mars and Jupiter, which no longer exists, having become the Solar System's asteroid belt. Proposed not long after the discovery of multiple asteroids at the beginning of the 19th century, the idea that the asteroids were fragments of a single planet was gradually abandoned over the course of the middle decades of the 20th century in favor of the conclusion that no planet had ever accreted in the region of the asteroid belt in the first place.
In fiction, various other names were given to the same or similar concepts.
- Seola (1878), novel by Ann Eliza Smith: mentions the existence of a "Wan Planet" between Mars and Jupiter, and that its destruction led to the deluge of Genesis.
- Time Wants a Skeleton (Astounding Science Fiction, June 1941), short story by Ross Rocklynne: characters travel through time to Phaeton, an Earth-like planet, just before it was destroyed in a collision with another (unnamed) planet.
- The Lost World of Time (Captain Future Magazine, Fall 1941), a Captain Future story by Edmond Hamilton: characters travel through time to the planet Katain and rescue the inhabitants before it was destroyed. Adapted to Japanese anime in 1978, where the planet is named Prometheus.
- Space Cadet (1948), juvenile novel by Robert A. Heinlein. The hero's first assignment after graduation from the Space Patrol's academy is to a ship charting the intractable Asteroid Belt. He has the luck to be involved in a startling discovery: not only is the Belt proven to be what is left of an exploded planet Lucifer, but also remains are found of that planet's inhabitants, who had been responsible for its destruction.
- Return to Mars (1955) juvenile novel by W. E. Johns. The fifth planet, called Kraka, was accidentally destroyed in a nuclear experiment carried out by its inhabitants.
- Chikyu Boeigun (The Mysterians, 1957), The solar system's asteroid belt is the remnants of the Mysterians' home planet, Mysteroid, destroyed as the result of a nuclear war.
- Rogue in Space (1957), novel by Fredric Brown. A living, intelligent, asteroid collects all the asteroids in the Belt and forms them into a planet with himself at its centre. In this variant the fifth planet exists not in the past but in the future.
- Fallen Star (1959), novel by James Blish. The fifth planet, called Nferetet, may have been destroyed by the Martians because they saw its inhabitants as a threat.
- Stranger in a Strange Land (1961), novel by Robert A. Heinlein. An unnamed fifth planet was destroyed by Martians after they deemed its inhabitants too barbaric to be allowed to exist. "[The Martians] encountered the people of the fifth planet.... and had taken action; asteroid ruins were all that remained"
- Faety (The Destruction of Faena), 1974 novel by Alexander Kazantsev. The asteroid belt is the debris of Faena, the fifth planet of the Solar System located just between Mars and Jupiter. Faena was destroyed thousands of years before the first civilizations of Earth appeared, following the activation of a doomsday device-like thermonuclear super weapon built by the native sentient species and the few of them who survived the explosion (by launching into space) had to seek refuge on Mars and Earth. The homo sapiens genus is thus assumed to be a mixture of local DNA and the Faetan genes.
- "The Ultimate Crime" (1976), a short story by Isaac Asimov, was actually the author's essay to qualify for entry into the Baker Street Irregulars, a group of Sherlock Holmes enthusiasts. In it, he speculates that Professor Moriarty's The Dynamics of an Asteroid was a scholarly work that attempted to compute the mass and location of the hypothetical fifth planet before its supposed destruction and the creation of the belt.
- Inherit the Stars (1977), first in the Giants series of novels by James P. Hogan. The planet Minerva exploded to form the asteroid belt 50,000 years ago. It was home to two intelligent races: the Giants 25 million years ago, and the Lunarians (nearly identical to modern man) 50,000 years ago. Also mentioned in the novels The Gentle Giants of Ganymede (1978), Giants' Star (1981), Entoverse (1991) and Mission to Minerva (2005)).
- In the Doctor Who story Image of the Fendahl (1977) the fifth planet was the home of the Fendahl, a malevolent entity that consumed all life. The Time Lords placed the planet in a time loop in the hope of imprisoning the creature, but it escaped and arrived on Earth in the form of a human skull.
- Andromeda Stories (1980–1982) by Keiko Takemiya & Ryu Mitsuse: a pair of robot characters who hail from Phaeton have been sent to explore the Andromeda galaxy, and find their home planet destroyed upon their return.
- Gall Force 2: Destruction (1987), depicts the 5th planet, Damia, is in fact a massive super weapon, the System Destroyer, intended to act as a trap to destroy the two opposing forces. It is sabotaged and destroyed, resulting in the current asteroid field.
- Mutineers' Moon (1991), novel by David Weber. The asteroid belt was a planet that was geologically unstable. The Achuultani attacked the planet with kinetic weapons, shattering it, and then attacked Earth, resulting in the extinction of the dinosaurs.
- Final Fantasy IV (1991), video game. The fifth planet is populated by a race of highly advanced humanoids who are aware that their planet is unstable. Thus they travel to Earth and craft a second moon to live on as the fifth planet explodes to create the asteroid belt. The character FuSoYa is a member of this race, which is called the Lunarians due to their living on the moon (the true name of their race is not said).
- End of an Era (1994), Robert J Sawyer. A time travel novel that explores the idea that Phaeton was not yet destroyed when this story takes place.
- Ocean (2004), comic by Warren Ellis: discusses the possibility of an ancient proto-human culture originating on Phaeton.
- Exiles #4 (June 2008): When the super hero group known as Exiles travel to a parallel dimension, they find out there is no asteroid belt, but a planet called Hera, which humans have not terraformed yet, although they have already terraformed Venus and Mars.
- Brian Lumley's story collection Caller of the Black, which contains many contributions to the Cthulhu Mythos, references Thyoph, the planet originally orbiting between Mars and Jupiter that was destroyed by an aspect of Azathoth.
- The Werewolf: The Apocalypse roleplaying game names the former planet Turog, governed by a planetary incarna (concept spirit) named Rorg the Hunter.
Trans-Neptunian planets 
Fictional planets in our Solar System beyond the orbit of Neptune have been employed many times as settings or references in science fiction. Following the general reception of Pluto as the ninth planet of the Solar System in 1930, a hypothetical additional planet was sometimes called a "tenth planet". Since 1992, a very large number of objects have been found beyond Neptune; all of the objects in the following list, however, are purely fictional. Common names for trans-Neptunian planets in fiction include Planet X, after a planet once believed to lie beyond Neptune, and Persephone (or Proserpina), after the wife of Pluto.
- In the Year 2889 (1889) short story by Jules Verne: Olympus is a massive planet beyond Neptune. It has a mean distance of 11,400,799,642 miles from the Sun (about 4 times the distance of Neptune), and orbits the Sun in 1311 years, 294 days, 12 hours, 43 minutes, and 9 seconds.
- Their Destiny (1912) by Donald W. Horner: Astronauts travelling to Alpha Centauri pass a planet beyond Neptune as they leave the solar system.
- The Whisperer in Darkness (1930), short story by H. P. Lovecraft, and other stories of the Cthulhu mythos by various writers: Lovecraft identifies Yuggoth (or Iukkoth) with Pluto, but other writers in the mythos claim that it is actually an enormous, trans-Neptunian world that orbits perpendicularly to the ecliptic of the solar system, accompanied by three moons: Nithon, Thog and Thok.
- The Puppet Masters (1951), novel by Robert A. Heinlein: The next planet after Pluto is called Kalki.
- A Life for the Stars (1962) by James Blish (collected in Cities in Flight, 1970) has a trans-Plutonian planet called Proserpina.
- Known Space books (1964-) by Larry Niven: Persephone is a small gas giant with a single moon, Kobold.
- Rendezvous with Rama (1972) and other works by Arthur C. Clarke refer to a tenth planet called Persephone.
- Charlie and the Great Glass Elevator (1972), children's story by Roald Dahl: The Vermicious knids are said to be from Vermes, a planet 18,427,000,000 miles from Earth (about 5 times the distance of Pluto).
- The Forever War (1974) by Joe Haldeman. The first part of the novel is set on a trans-Plutonian planet called Charon. (This is not Pluto's moon, as the story was written before Charon's discovery in 1978.)
- "The Borderland of Sol" (1975), short story by Larry Niven that takes place ca. 2640. Pluto is dismissed as an escaped moon of Neptune, while the solar system's outer planets are listed as Neptune, Persephone, Caïna, Antenora, and Ptolemea, after the innermost rounds of Dante's Inferno, with Judecca reserved for the next discovery.
- Schrödinger's Cat trilogy (1980) by Robert Anton Wilson. The tenth planet is named Mickey and the eleventh Goofy (after characters in Disney cartoons).
- Mostly Harmless (1992) by Douglas Adams. The tenth planet is officially called Persephone, but nicknamed Rupert (after "some astronomer's parrot"), and is inhabited by the crew of a spaceship who have forgotten almost everything about their mission, except that they are supposed to be "monitoring" something.
- The Tenth Planet trilogy (1999–2000) by Dean Wesley Smith and Kristine Kathryn Rusch: A tenth planet circles the Sun and its alien inhabitants periodically harvest Earth's resources.
- Galileo's Dream (2009) by Kim Stanley Robinson There are several outer gas giants named. Some of which are described as being converted into energy for time travel. The tenth planet is named as Hades.
Film, TV and radio 
- The Tenth Planet, radio play broadcast Sept. 7, 1952 on Hollywood Star Playhouse. It starred Joseph Cotten, Hans Conreid, and Joan Banks Lovejoy. Cotten is kidnapped by aliens inhabiting a planet beyond Pluto.
- In the 1975 TV series Star Maidens, the planet ruled by women is known as Medusa. Described by one of the Medusans as being "on the outer limits of your solar system", the opening titles of the premiere episode indicates that a comet pulled Medusa out of its own solar system—forcing its people underground—and it eventually slipped into orbit around Earth's sun. No longer in the heat of its original sun, Medusa is small, rocky and cold, though the Medusans have the technology to conduct industrial operations on the surface.
- Star Trek Maps, a 1970s publication by Bantam Books, indicates that the Star Trek universe includes a tenth planet in the solar system called Persephone that orbits at a great distance from the Sun. This statement is not supported by any Star Trek film or TV episode, and a later, similar work, Star Trek Star Charts by Pocket Books, makes no mention of this world.
- ALF (1986–1990): In one episode, ALF reveals to Brian that two planets exist beyond Pluto. When Willie sarcastically asks if they are named "Mickey" and "Donald," ALF matter-of-factly tells him no; they are named "Dave" and "Alvin." Later Willie explains that "Dave" could be Chiron, a minor planet once labeled the "tenth planet" by the press.
- K-PAX (2001 film): An alien character played by Kevin Spacey tells the character played by Jeff Bridges that there are ten planets in Bridges's solar system.
- The cartoon Duck Dodgers in the 24 1/2 Century features astronauts Daffy Duck and Porky Pig looking for "Planet X", and then having to battle Marvin the Martian for it.
- In the anime series The Vision of Escaflowne (1996), there exists an invisible (from earth) third member of the earth-moon system, called Gaea, on which the majority of the story takes place. The earth, which is visible in the Gaean sky along with the moon, is referred to as the "Mystic Moon".
- In the anime series Space Battleship Yamato (1974) there are eleven planets in the solar system. In the English dub, the first season names the tenth planet Minerva (destroyed by the Gamilons, it's not clear if it became an entire asteroid belt or just a large asteroid field), and the second season names the eleventh planet Brumus (attacked by the Comet Empire).
- In the Dragon ball series (1989–1996), there's a tenth Planet or a brown dwarf called the Makyo Star every 12,000 years, it passes close to Earth which power all the Makyo demons inhabiting Earth.
- In the Sailor Moon series (1992–1997), there exists a tenth Planet called Nemesis which is controlled by the villains of the Black Moon Clan. The planet is said to be radiating negative energy and can disappear from sight, only trackable via X-rays.
- In the animated television series Exosquad (1993), the Solar System contains an invisible tenth planet composed of dark matter. It was discovered by the Pirate Clans who named it Chaos and later offered it as safe haven to the Exofleet.
- In the Mutant Chronicles universe (1993), the 10th Planet, Nero, is the home of portals used by The Dark Legion to gain access into our galaxy through which they plan to enslave or destroy mankind. The planet is named after the Imperial Cardinal who had prophetic visions of the black planet, visions which also warned him of death.
- Camelot 3000 (1982), comic book: Scientists discover a tenth planet in 3000 AD. It is later revealed to be the homeworld whence the aliens (led by Morgana LeFay) attack Earth. Eventually King Arthur and his Knights of the Round Table are teleported there with the help of the Lady of the Lake.
- 2001 Nights (1984), manga by Yukinobu Hoshino, Night 7, "Lucifer Rising": A tenth planet dubbed Lucifer and its three moons Cassius, Brutus, and Judas are discovered. The expedition to Lucifer becomes a perilous and tragic one when it is discovered that Lucifer is composed of antimatter.
- Godzilla: Monster of Monsters (1989), videogame: Planet X is said to initially exist between Neptune and Pluto and causes the two planets to switch positions in the solar system while Planet X itself becomes the literal tenth planet in the system and is shown to be artificial, though mountains and jungles exist on it.
- Battlezone II: Combat Commander (1999), computer game: A tenth planet called Dark Planet is not discovered for some time because it was obscured by the Kuiper belt.
Elsewhere in the Solar System 
- Monster Zero (1965), the 6th Godzilla film: Aliens from Planet X (located between Jupiter and Saturn) try to conquer the Earth to take its water supply because water is scarce on their planet.
- The Lost Planet (1953) describes journeys to Hesikos, a fictional asteroid with highly eccentric orbit whose humanoid inhabitants renounced nuclear power after a meltdown, but have meanwhile developed broadcast telepathy. A happy ending ensues when Earthmen provide safe nuclear technology in return for thought projections from Hesikos to reduce fear and aggression here.
- Eros appeared in a Golden Age Wonder Woman story. It is ruled by women who consider prison terms a reward and are more scientifically advanced then Earth. It can be reached through astral projection while sleeping. Wonder Woman is sent there by Queen Desira to fight a rogue Woman Scientist who is trying to help men take over the planet.
Rogue planets 
Rogue planets in fiction usually originate outside the solar system, but their erratic paths lead them to within detectable range of Earth. In reality, no rogue planet has ever been detected transiting the Solar System.
- When Worlds Collide (1933), novel by Philip Wylie and Edwin Balmer: Extrasolar planets Bronson Alpha and Bronson Beta enter the Solar System: Bronson Alpha destroys the Earth, Bronson Beta assumes its orbit.
- Flash Gordon (1934), comic by Alex Raymond: Rogue planet Mongo threatens to collide with Earth.
- Super-Neutron (1941) short story by Isaac Asimov, where it is claimed that a rogue planet could cause the Sun to explode.
- The Man from Planet X (1951) is an early space-alien film. In the film, the orbit of the hitherto unknown extrasolar Planet X brings it close to Earth.
- The Tenth Planet (1966), serial of the Doctor Who TV series: An extrasolar planet, Mondas, enters the solar system beyond Pluto, making it temporarily the tenth planet. It originated in the solar system with an orbit near that of Earth before the native Cybermen powered it with an engine and moved it out of the solar system.
- The first episode of Space: 1999, a science fiction series of the mid-1970s, involved an exploration of a rogue planet named Meta.
- Transformers (1984) toys and spinoffs: Cybertron is a robot-inhabited rogue planet that comes close to Earth.
- Sunstorm (novel) (2005): an alien race from the star system of Altair sends a rogue Jovian planet into the Sun, setting the stage for a solar storm intended to wipe out humanity in the year 2042.
- Melancholia (2011): the planet Melancholia is on collision course with Earth, but is first believed to be simply passing by. The planet ultimately collides with Earth, causing the end of the world at the conclusion of the movie.
- Uploaded to Project Gutenberg on 5 July 2009
- Republished in the 1963 anthology Exploring Other Worlds (ISBN 0-02-023110-5) and the 1973 collection The Men and the Mirror (ISBN 0-44-152460-5)
- The Ufo Book of Lists| By STEPHEN J SPIGNESI, Stephen J. Spignesi|
- Strange Secrets: Real Government Files on the Unknown By Nick Redfern, Andy Roberts]
- Actors: William Griffis, Ralph Bell, and Gregory Morton; Producers: Sherman H. Dreyer and Robert Weenolsen (1950-11-15). "Worlds Apart". 2000 Plus. Episode 37. 26:23 minutes in. MBS. http://www.archive.org/download/otr_2000Plus/1950-11-15_0036-28m08s-2000Plus-WorldsApart.mp3.
- Andrea Magrath (2011-05-18). "Sunny Kirsten Dunst is picture perfect at the Cannes photocall for her provocative new film Melancholia". Daily Mail (London). Retrieved 2011-05-27.
- Heinlein Society Updates
- Cities in Flight (Avon, 1970, p.151.
- The Man from Planet X (1951) at the Internet Movie Database