The Mad Doctor's Lab is an area found in Epic Mickey and Epic Mickey 2: The Power of Two.
Epic Mickey
In Epic Mickey, the Mad Doctor's Lab took place in Dark Beauty Castle, in the beginning of the game. Mickey is trapped by the Mad Doctor and he tries to take Mickey's heart from him by using several tools from a chainsaw to a plunger. However, Mickey doesn't give up and he throws the plunger at the Mad Doctor. Mickey breaks out and grabs the brush whcih scares the Shadow Blot and the Mad Doctor escapes. Oswald is seen by Mickey and he also gets away. Mickey is left alone with the Mechanical Arm and he must fight and get out. Mickey also find Gremlin Gus in that area.
The Mad Doctor's Lab in Epic Mickey
Epic Mickey 2: The Power of Two
The Mad Doctor's Lab takes place in Disney Gulch. When you go inside the building, you encounter the Blotworx Dragon and you must fight it. Once you befriend it or defeat it, the Mad Doctor starts to sing in an animated 2-D cutscene.