Runaway Brain was a 7-minute animated short-subject produced by Walt Disney Feature Animation Paris, and starring Mickey Mouse and Minnie Mouse in Mickey's last theatrical short to date. It was released on August 11, 1995 attached to the feature A Kid in King Arthur's Court where it was promptly overlooked since that movie tanked. It was re-released in front of the live action George of the Jungle movie which if memory serves me right...also tanked. The short was then for the most part forgotten by Disney or just generally overlooked although the "evil" Mickey from the short did show up on some Disney Villains merchandise found at Diney World in 2000 ( I know because I bought them).
In recent years there seems to be a growing trend for highly collectible products featuring the "evil" Mickey including Kubrick figures, high end Vinyl figures and super articulated action figures.
In an attempt to convince Minnie that he hasn't forgotten to buy her an anniversary present, Mickey Mouse ends up promising to take her to Hawaii. Funds being short, he applies for a job as lab assistant to the sinister Dr. Frankenollie, who happens to be searching for a donor to provide his monstrous creation with a brain...
That was sumthin' hunh...Disney and Monsters...perfect together