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Billie is a character from Pinky and the Brain. She is a lab mouse that was also altered like Pinky and the Brain. Brain romantically pursues her, despite the fact that she is very similar to Pinky. She was also more interested in Pinky than The Brain. Despite Billie having great intelligence, she can act a bit ditzy at times. Billie first appeared on Animaniacs in the short "The World Can Wait"
- Animaniacs "Episode 44" (The World Can Wait)
- Season 03, Episode 03 "Brain Noir"
- Season 03, Episode 30 "You'll Never Eat Food Pellets in This Town, Again!"
- In You'll Never Eat Food Pellets in This Town, Again! the characters are portrayed as actors, working on the show Pinky and the Brain. Brain is married to the actress "playing" Billie, Sheila. She complains about not being featured in many episodes.