Doctor Frankenollie is the Big Bad of the Mickey Mouse short film Runaway Brain.
He is depicted as an insane monkey and a parody of the infamous Dr. Victor Frankenstein.
Doctor Frankenollie is a mad scientist who attempted to switch Mickey's brain with that of his giant monster Julius. He put an ad in the newspaper promising to pay his employer 999 dollars. Mickey, who is looking for such payment to fulfill Minnie's desires to go to Hawaii, answers the ad and falls into Frankenollie's trap. Frankenollie prepares to operation by attaching helmets to Mickey and Julius's heads before activating a switch, laughing maniacally. Mickey awakes to find himself in Julius' body, thus the operation is successful. Mickey finds a charred Frankenollie and tells him to change him back, but Frankenollie's body disintegrates and turns to a skeleton in Mickey's hands.
- Frankenollie's name is a portmanteau of two of Disney's Nine Old Men, Frank Thomas and Ollie Johnston.