It's dressing up time, and Timmy gets to play Doctor but he won't take his costume off and insists on treating his class-mates as patients. But when a mysterious case of spots breaks out during Art Time, his friends turn to Doctor Timmy to find the cure.

Episodes:

Doctor Timmy;
Timmy's Cookie;
Timmy's Big Search;
Baby Time Timmy;
Timmy Finds Aliens;
Ballerina Timmy;
Boing Boing Timmy;
Timmy in Tune