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Doctor 13 is a "Doctor" incidental who appears in the episodes "Code Yellow" and "My Leg!"
Description[]
He is a yellow fish with a small light green dorsal fin who wears glasses, a white doctor's coat, teal pants, and a head mirror. He also has a big mouth.
Role in series[]
Doctor 13 has appeared in only two episodes so far. He has been portrayed as a doctor in both of his appearances. He makes his most prominent appearance in "My Leg!" as the doctor of Fred.
Roles[]
"Code Yellow"[]
He is part of the Bikini Bottom Hospital operating theater audience. SpongeBob pulls his clipboard out of Squidward's nose.
"My Leg!"[]
The doctor appears to remove Fred's cast on his leg and he tells Fred to be more careful with his leg or else he will have to replace it with a robot's leg. Fred finds this cool, but his doctor tells him that it is not and that the leg will be taken from another robot. He is then seen at the end of the episode, dancing and grinning to Fred's song.