In the good ending, Mickey splashes the Mad Doctor's face with paint, giving him a realMy God, What Have I Done? moment before he uses his machine to rescue himself, Mickey, and Oswald from falling into the Thinner river. Later, the trio are brought back to a group of people, and the Mad Doctor realizes what being a toon is about. As a result of Mickey and Oswald's good actions, the Tints (paint guardians) transform the Mad Doctor into a real toon.
Oswald and Ortensia, full stop. "Good luck, hunny bunny!" :D