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The comic book Back to the Future 4 is an adaptation of this episode.
On April Fool's Day, Jules and Verne "sabotage" many of Doc's inventions, including his Brain-wave analyzer. After using the tampered machine, Doc thinks he has used up 99.9% of his brain and retires from science. After many attempts at seeking other employment (parking cars, mowing lawns, making pizzas), he goes back in time to the Cro-Magnon period and unsuccessfully tries to show the proto-humans how to make fire. Realizing that there are still things left to invent (the wheel, etc...), he decides to go to Marty's rock and roll concert - it is something totally mindless. Marty has "borrowed" one of Doc's tampered inventions - the Environmental Adjuster - to create special effects for the concert and in doing so, creates a catastrophic rainstorm/flood. After accidentally tearing up the curtain, when Marty lands into the water along with Jules and Verne, it's up to Doc to use his remaining "0.01%" of his brain to get everyone out of danger. The boys confess to their pranks and the inventor returns to his life of science.
Behind the scenes
- Marty's band The Pinheads had last been seen in 1985 in Back to the Future.
- April 1, 1991 was on a Monday (Doc introduces the episode by explaining that this happened on the most recent April Fool's Day), and Marty's concert is four days later on a Friday.
- While in the Cro-Magnon period, Doc at one point says "D'oh," Homer Simpson's catchphrase. Dan Castellaneta voiced both Homer and the animated version of Doc.
- When Clare said that there's a lot of jobs that doesn't require brains, Doc thinks of the rumor that politics don't think of what they do.
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Weapons and technology