Dr. Actor is a minor character who first appears in the episode "The Lost Mattress." He also makes a somewhat major appearance in the episode "All That Glitters," when it is revealed that he is simply an actor doing research for a part.
Dr. Actor is a slim, lavender fish. He is seen wearing a white doctor uniform with a green tie and a light yellow undershirt. He has large light purple lips and a lavender fin on his back. He is dressed like a doctor.
He once auditioned for a play, or most likely, a soap opera (possibly a Soap Opera Channel production), but he unfortunately did not get the call-back. He then became a full-time doctor.