Assignment: Earth

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"Assignment: Earth"
Star Trek: The Original Series episode
Episode no.Season 2
Episode 26
Directed byMarc Daniels
Story by
Teleplay byArt Wallace
Cinematography byJerry Finnerman
Production code055
Original air dateMarch 29, 1968 (1968-03-29)
Running time50 minutes
Guest appearance(s)

(uncredited) and Isis' cat vocalizations (uncredited)

Episode chronology
← Previous
"Bread and Circuses"
Next →
"Spock's Brain"
Star Trek: The Original Series (season 2)
List of Star Trek: The Original Series episodes

"Assignment: Earth" is the twenty-sixth and final episode of the second season of the American science fiction television series Star Trek. Written by Art Wallace (based on a story by Wallace and Gene Roddenberry) and directed by Marc Daniels, it was first broadcast on March 29, 1968.[1]

Engaged in "historical research", the Enterprise travels back through time to 1968 Earth, where they encounter an interstellar agent planning to intervene in 20th-century events. Kirk and Spock are uncertain of his motives.

Originally written as a standalone half-hour television series, when no network chose to order a pilot, the script was reworked to fit into Star Trek as a backdoor pilot for the proposed Assignment: Earth series.[2]


The USS Enterprise, which has time-travelled to 1968 Earth for historical research, intercepts a powerful transporter beam originating from one thousand light-years away. A man called Gary Seven (Robert Lansing), dressed in a 20th-century business suit and accompanied by a black cat he calls Isis, materializes on board the Enterprise. Realizing that Captain Kirk and his crew are from the future, Seven warns Kirk that history will be changed if he is not released immediately. Having no proof of Seven's claim, Kirk has him held in the brig. Meanwhile, Spock searches the history database and finds that the United States will launch an orbital nuclear weapons platform in a few hours.

Seven, with the help of his pen-sized "servo" device, escapes and beams down to an office in Manhattan, emerging from a vault door hiding some kind of teleporter. Activating a computer, he identifies himself as "Supervisor 194" and inquires as to the whereabouts of two agents, "201" and "347", who he learns have not been heard from in three days. Seven decides to complete their mission himself. A young woman arrives, whom Seven mistakes for Agent 201, but who is actually Roberta Lincoln (Teri Garr), a secretary employed by the missing agents. Seven then tells Roberta he is a CIA agent, and, appealing to her patriotism, asks her to remain and assist him. The computer eventually discovers that Agents 201 and 347 have died in an automobile accident.

Kirk and Spock track Seven to his office. Roberta stalls them while Seven and his cat enter the vault and are teleported away. Arriving at "McKinley Rocket Base", Seven gains access to the gantry and climbs onto an access arm in order to rewire the circuits of the soon-to-launch rocket.

When Kirk and Spock pursue Seven to McKinley Rocket Base, they are immediately detained by police. On the Enterprise, Chief Engineer Scott (James Doohan) locates Seven and attempts to beam him up. At the same time in New York, a curious Roberta explores the office and accidentally activates the vault controls, intercepts Scotty's transporter beam, and brings Seven to the office.

Seven takes control of the rocket remotely, arming its warhead and sending it off-course. McKinley Base controllers frantically try to destroy the missile without success. After a failed attempt to call the police, Roberta hits Seven with a heavy cigar box and seizes the servo. Seven pleads with her to allow him to proceed, "...or in six minutes, World War III begins!"

Scotty beams Kirk and Spock from the base to Seven's office. Seven pleads with Kirk to let him complete his plan, which is to destroy the missile at a low enough altitude to deter the use of such orbital platforms in the future. Kirk intuitively decides to trust Seven who, with only seconds to spare, safely detonates the warhead at an altitude of 104 miles.[3]

In the epilogue, Spock and Kirk explain to Seven that the Enterprise was meant to be part of the day's events, citing their historical records. Seven is curious to know more, but they reveal only that he and Roberta will have an interesting future.

Production and reception[edit]

This is the only original series episode to list the guest star after the episode title before the writing credit.[4]

Roddenberry intended guest performers Robert Lansing and Teri Garr (Gary Seven and Roberta Lincoln), to continue in the new series if it was commissioned, but since NBC was not involved in casting the backdoor pilot, it could have insisted on changes or even recasting had it picked up the show.[5]

"McKinley Rocket Base" is a fictional location, most resembling the real-life rocket base, Cape Canaveral Air Force Station, from which much of the stock footage in the episode came from. NASA provided Gene Roddenberry with the footage of a Saturn V rocket, with the Apollo 4 capsule, and additional footage specifically filmed for Star Trek.[6]

Isis the Cat casting[edit]

The uncredited human form of Isis was portrayed by actress, dancer, and contortionist April Tatro. Her identity was unknown until 2019, when The Trek Files podcast cited a production call sheet for extras dated January 5, 1968, and host Larry Nemecek interviewed her for confirmation.[7]

Previously in fan circles it had been speculated that the briefly seen human form of the cat Isis was portrayed by actress Victoria Vetri, and this has been repeated so often that many articles and websites treat it as fact. However, Vetri herself confirmed that she was not in the episode.[8]

Comic book[edit]

In 2008, IDW Publishing launched an Assignment: Earth five-issue comic book series written and drawn by John Byrne. The stories show the characters' lives from 1968 up to 1974, including Seven and Roberta's peripheral involvement in the events of a prior episode, "Tomorrow Is Yesterday" (occurring before "Assignment: Earth" for the Enterprise crew, but after for Seven and Roberta). An epilogue set in 2008 depicts an annual reunion between Roberta and Isis (in her humanoid guise) at the Vietnam Veterans Memorial to honor a friend who had been killed in that conflict.[citation needed]

In 2010, the characters appeared in issues #3 and #4 of Star Trek: Leonard McCoy Frontier Doctor.[9]


Author Greg Cox has included Gary Seven and Roberta in three of his Star Trek novels: Assignment: Eternity; and a two-part novel, The Eugenics Wars: The Rise and Fall of Khan Noonien Singh. In the latter two novels Gary Seven and Roberta Lincoln go on to eventually stop Khan Noonien Singh and his fellow genetically engineered humans from taking over the planet.[10]

In the Peter Clines novel "Fold" a character comes from an alternate universe and has a cat named Isis after the cat from her favorite TV series "Assignment Earth" with no knowledge of the show Star Trek. Her version from this dimension has a cat named Spock.


  1. ^ Retrieved October 2, 2018.
  2. ^ "Pilot: Assignment: Earth (non-Star Trek version)". Retrieved 2018-11-13.
  3. ^ "Star Trek S2 E26". TV Tropes. Retrieved 2019-03-20.
  4. ^
  5. ^ Retrieved October 2, 2018.
  6. ^
  7. ^ Nemecek, Larry (12 March 2019). "The Trek Files" (Podcast). Roddenberry Podcast Network. Retrieved 12 March 2019.
  8. ^ Reed, Michael Augustine. "Interview with Victoria Vetri — "Sanna"". LITTLE SHOPPE OF HORRORS magazine #41: 71.
  9. ^ "Star Trek: Leonard McCoy, Frontier Doctor from IDW 2010". Retrieved 2019-03-12.
  10. ^ Star Trek: The Eugenics Wars: The Rise and Fall of Khan Noonien Singh. 2002-04-10. ISBN 9780743451635.

External links[edit]