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- He is absent in Gadget and the Gadgetinis. He only appears in "No Brainer," but it turns out he has developed a strong fear of gadgets due to his hatred of the times when he was forced to rescue Gadget at every turn and Gadget mistaking him for MAD Agents. He was relieved to never have to defend Gadget again and he even put up signs around his home that says he doesn't want Gadget around, so Penny lied that Brain was dead. Brain still loves Penny as they were best friends in the original cartoon.
- Though he is absent in Gadget and the Gadgetinis, he still appears in the French closing credits.
- In the live-action film, he is portrayed as a beagle and shows no personification, despite being a yellow dog in the cartoon who can walk on his hind legs and often dressed up in disguises. At the end of the film, he has a line of dialogue spoken by Don Adams, the voice actor for Gadget in the original cartoon.
- In Inspector Gadget 2, he plays a slightly larger role when Gadget uses Baxter's bark translator to enable Brain to tell him the whereabouts of Penny after she is kidnapped by Dr. Claw. Here, Brain was voiced by Jeff Bennett.
- In Polish, his name is Łepek.
- His, Penny Brown, and Inspector Gadget's appearances in the Stephen Squirrelsky and Friends' movie spoof travels are Simba (Shrek), The Great Hedgehog Detective, The Sword in the Stone, Vanellope Von Schweetz, The Train and the Boat, Toon Age, Hoodwinked!, The Rescuers, Nikki's Adventures of Sing Along Songs Episode 4, The Rescuers Down Under, The Secret of NIMH, Nikki's Adventures of Sing Along Songs Episode 6, Skunkules, Home on the Range, Kermit's Winter Wonderland, The Little Jungle Boy, Kermiladdin 2: The Return of McLeach, AiAi the Monkey and A Day for George, The Reindeer and the Deer, Animal Story 2, AiAi the Monkey's Grand Adventure: The Search for Tails, A Cartoon Character's Life, Nikki's Adventures of Sing Along Songs Episode 7, Here Comes Winnie the Pooh, Animals, Inc, Simba 2, Miss Bianca and the Bernard 2: Fievel's Adventure, FernGully: The Last Rainforest, A Pooh in Central Park, Bubblesrella 2: Dreams Come True, The Brave Little Piglet, Kung Fu Owen, Nikki's Adventures of Sing Along Songs Episode 8, The Thomas O'Malley Movie, Kermit Returns, Fievel the Red Nosed Mouse and The Island of Misfits, Nikki's Adventures of Sing Along Songs Episode 9, Cloudy with a Chance of Meatballs, Finding Alvin, Animated Tale, The Forest Book 2, Nikki's Adventures of Sing Along Songs Episode 10, Madagascar, and Sleeping Beauty and will even be in more movie spoof travels.
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