Fleischer is better known as the voice of Roger Rabbit in Who Framed Roger Rabbit, starring across Christopher Lloyd as Judge Doom and was also directed by Robert Zemeckis. (Pat Buttram also voiced a small role.)
Fleischer would return to Walt Disney Studios much later to film the science fiction comedy Genius, a Disney Channel Original Movie where he plays a role somewhat akin to the Doc/Marty relationship. Fleischer played a physics professor who acted as mentor to an intelligent boy who both worked to find a way to make an anti-gravity device operational.
From 2001 to 2002, Fleischer made guest appearances in the second and third seasons of 100 Deed For Eddie McDowd, with one as a character: Dr. Silver. The other three were voice-overs. The episodes included Season 2-3 regular Jason Hervey voicing the title character.