|The Adventures of Jimmy Neutron: Boy Genius|
|Season 2, Episode 30|
|Airdate:||March 8, 2004|
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|"Love Potion #976/J"||"Maternotron Knows Best"|
After Sheen fails a history test, Jimmy uses his reconfigured Brain Drain Helmet to increase Sheen's brain to be larger and smarter, but Sheen soon becomes evil with his new mental powers and plots to destroy all of Retroville. Now Jimmy and Carl have to stop him from plunging Retroville into mass destruction and chaos or else his head will keep growing until it explodes.
- This episode was ranked #72 in The 100 Greatest Nicktoon Episodes countdown.
- Sheen firmly believes in Ultra Lord, even when he's a god.
- Sheen wrote the Ultra Lord website.
- This is the first episode to feature Nick's new jacket.
- Since only Sheen's brain was supposed to grow and not his head, it should've already exploded.
- This is the first time one of the protagonists becomes evil. The second will be in The Tomorrow Boys.
- Sheen killing his friends and then tearfully regretting it could be a reference to the story, "A King and his Hawk" in which the king regrets murdering his dear friend.
- Sheen's answers were:
- Ultra Lord is the father of the whole planet.
- When Ultra Lord beat Megalon playing chess. His score was four..
- On planet Xaradan where Ultra Lord goes on vacation.
- A dragon thought it was a hat and it was too small.
- Footage from Ultra Sheen appears in this episode.
Home video releases
- The Adventures of Jimmy Neutron: The Best of Season 2
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