Man from Atlantis

Mark Harris

C.W. Crawford

Dr. Elizabeth Merrill

Airlock Officer (15 episodes, 1977-1978)

Jane (9 episodes, 1977-1978)

Patrick Duffy didn't own a swimsuit when he auditioned for the show; he had to audition in his one unripped pair of Fruit of the Loom briefs.

First American television series purchased by the People's Republic of China.

Patrick Duffy had to shave his body to play Mark Harris. He originally used foam and a razor, saying he "took the longest showers you ever saw," but switched over to an electric shaver during the show's run.

Support wires are visible above the submarine Cetacean depending on the angle of view. Also, when the sub surfaces or submerges in the ship's home base, rising bubbles and surface waves reveal the actual size of the supposedly huge vessel.