The crew prepares to venture into Fry's intestines.
|Episode no.||Season three
|Directed by||Peter Avanzino|
|Written by||Eric Kaplan|
|Original air date||January 21, 2001|
|Opening caption||"If Not Entertaining, Write Your Congressman"|
|Opening cartoon||"Aladdin and the Wonderful Lamp" by Ub Iwerks (1934)|
|Season three episodes|
"Parasites Lost" is the second episode in season three of Futurama. Although the title is a play on John Milton's epic poem Paradise Lost, the episode is a parody of the 1966 film Fantastic Voyage. The plot also borrows from the novel Flowers for Algernon. It originally aired in North America on January 21, 2001.
While making a pit stop at an interstellar truck stop, Fry buys and eats an extremely old egg salad sandwich from a vending machine in the restroom. On returning to Earth, Fry and Bender are assigned the task of fixing the plasma fusion boiler, which promptly explodes. Bender is not damaged, but Fry is impaled by a large pipe. Despite the severity of the injury, Fry's damaged body repairs itself in seconds, and the subsequent medical examination reveals to the crew that Fry is infested with microscopic worms from the egg salad.
To eliminate the infestation, Professor Farnsworth makes miniature robotic versions of the crew, except for Fry and Leela. Because the worms know all that Fry knows and would thus defend themselves if Fry knew about the mission, Leela is assigned to distract Fry, who is not told what is happening. Controlling the micro-droids using virtual reality gear — which is apparently cheaper than actually shrinking the crew themselves — the crew board a miniature Planet Express ship, and enter Fry's ear. Throughout the travel, the crew discover that the worms are drastically improving Fry's intelligence, health and fitness.
The crew make their way into Fry's bowel, and fight their way to the pelvic splanchnic ganglion, intending to cause a massive bowel movement to expel the worm society (or, as the Professor puts it, "Listen, this is gonna be one hell of a bowel movement; afterwards, he'll be lucky to have any bones left"). Meanwhile, Leela is enchanted by the now intelligent and muscular Fry. He then reveals that he loves her but only recently was he able to articulate his thoughts. She realizes that the worms are responsible for the new, improved Fry, and sets out to stop the Professor. Her micro-droid reaches the nerve, and hacks the rest of the micro-droid crew to pieces with an axe. The Professor tells her that the worms will burrow so deep into Fry's body, he will be stuck with them forever, but Leela reasons that Fry is better off with the worms.
Fry is informed of what has been happening, but is more interested in romancing Leela than clearing the worms out of his body. Although the two share a romantic evening at Leela's apartment — made more powerful when Fry composes Leela a sonnet on the complex musical instrument the Holophonor — Leela tells Fry that she loves the new him. Worried, Fry tells her that he needs to find out something, leaves and, using his own micro-droid, enters his own body.
Fry confronts the worm leader and engages him in a swordfight after asking the worms to leave so he can learn if Leela loves him or just what they have made of him; he eventually blackmails the worms into leaving by threatening to kill himself by destroying the medulla oblongata, and they comply. With the worms gone, Fry returns to Leela's apartment, intent on finding out if Leela can love him as he truly is. Fry explains to Leela about the worms, and his decision to dispose of them. His awkward attempts at being romantic end when he mentions his previous relationship with Amy, and Leela kicks him out of her apartment. Back at his apartment, Fry begins to re-learn the Holophonor, and creates a crude image of Leela.
Peter Avanzino, director of the first four broadcast seasons of Futurama and two of the straight-to-DVD movies, has stated that episodes with challenging new scenes to draw are his favorites. In particular he notes that he thinks this episode is fun because "It has microscopic characters inside a human body, a 3-D colonoscopy, a sword fight, a holophoner sequence (involving otters and characters dancing on Saturn's rings), some sweet sweet lovemaking, and a space-truck stop."
Broadcast and reception 
The storyboard artist for this episode, Rodney Clouden, was honored with an Emmy award in 2001 for "Individual Achievement in Animation". This episode is also a fan favorite and in 2006 IGN named it as number four in their list of the top 25 Futurama episodes. IGN praised the episode for both its humor and the deepening of Fry and Leela's relationship, particularly the scenes where Fry is willing to "hurt himself and lessen what he has become for Leela". In 2007 Entertainment Weekly named Futurama number 21 on their list of the top 25 science fiction movies and TV shows of the last 25 years (1982–2007). In the article, this episode was identified as the "best bit" of the series.
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- "Flowers For Algernon Syndrome - Television Tropes & Idioms". Retrieved 2010-02-10.
- Scott Weinberg (2007-11-14). "Interview: 'Futurama' Movie(s) Producer(s) & Director(s)!". Retrieved 2008-01-21.
- "Voiceover, Animation Emmy Winners Honored". 2001-09-13. Retrieved 2007-07-04.
- Azrai, Ahmad (2004-10-31). "Farewell to the funny future". Asia Africa Intelligence Wire. Retrieved 2008-01-10.
- "Top 25 Futurama Episodes". Retrieved 2006-11-04.
- "The Sci-Fi 25". Entertainment Weekly. Retrieved 2007-06-21.
- "BroadcastWatch.(broadcast network prime time ratings by program for week of January 15–21, 2001)(Brief Article)(Statistical Data Included)". Broadcasting & Cable (Reed Business Information). 2001-01-29. Retrieved 2009-03-08.
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