The Man from Atlantis was a TV show about a man found barely alive after being washed up on the beach after a storm. Chanced upon by Dr Elizabeth Merrill (Belinda Montgomery), of the Foundation for Oceanic Research the man is rushed to hospital, but it soon comes to light that there is something unusual about him; he has gills, and webbed hands and feet. Dr Merrill soon comes to the conclusion that the man is the last survivor of the fabled, Lost Continent of Atlantis.
On nursing him back to health, she gives him the name, Mark Harris (played by Patrick Duffy, later Bobby Ewing, in Dallas). The Man From Atlantis has brilliant green eyes, can swim faster than a dolphin, and has superhuman strength and senses. He wears distinctive yellow swimming shorts, and to begin with, his speech is somewhat pigeon-English.
He joins Elizabeth and the Foundation, headed by 'CW'. His adventures with the good Doctor and the crew of the super sub, 'Cetacean' involved sea monsters, aliens, time travel, mad scientists and a super villain, named Mr Schubert.