The Computer and Mouse are two of the major characters from The Brave Little Toaster Goes to Mars and The Brave Little Toaster to the Rescue. There are voiced by Kevin Meaney and Victoria Jackson respectively.
Rob McGroarty's Computer and Mouse play a major role in this film. They befriend Lampy when the Master uses him to shine his light on the screen. Rob was typing his college thesis titled The Hidden Lives of Animals. He had nearly finished when the electricity went out and the screen said NO FILE EXISTS. So Rob and his girlfriend Chris decided to call their friend Charlie, a computer genius to help them fix it. Charlie tried to fix it, but it was no use. He didn't know what was happening, but he told Rob that there must have been some computer virus.
The night when Wittgenstein got his power back, he returned the thesis to Rob's computer and gave him the list of animals that were being kidnapped on the truck to Tartarus Laboratory. Later the next morning, every single page of Rob's thesis printed, then Mouse said that the Master would be so happy, and indeed he was.
Computer and Mouse make a brief appearance in this movie. On the way back from Mars, onto home on Earth, they are shown during Lampy and Radio's daydream of them for light and music while typing.