"A computer's gotta do what a computer's gotta do!"
Wittgenstein is a supercomputer and a secondary protagonist in the films The Brave Little Toaster Goes to Mars and The Brave Little Toaster to the Rescue. His first chronological appearance was in The Brave Little Toaster Goes to Mars, he plays a significantly smaller role. When the Master's infant son is sent to Mars, Toaster and friends consult Wittgenstein, who explains to them what they need to travel to Mars. He isn't seen again after that scene, though he is mentioned shortly after by Toaster when explaining to Ratso that he can't breathe in space.
In The Brave Little Toaster to the Rescue, in which he is first seen abandoned in a basement and infected with a virus. He stars in the song "Chomp and Munch" alongside the personified viruses inside him. Later, the virus seemingly destroys him, however, after Radio sacrifices his own tube, Wittgenstein is restored to full power and assists the protagonists in rescuing the animals who are being sent to an inhumane testing laboratory for money.
In both films, Wittgenstein is voiced by Brian Doyle-Murray.