Man from Atlantis - Season 1 - Eps 11: Imp
An impish little man enters an underwater station and causes the crew to become irrational simply by touching them. After three crewmen die, the F.F.O.R. hears Duke, the last crewman, talking over the radio in a childish manner and investigates. Mark swims over and brings Duke over to the Cetacean, not knowing the imp has stowed aboard.
About Man from Atlantis

Title: Man from Atlantis
First Air Date: 1977-09-22
Last Air Date: 1978-06-06
Status: Canceled
Rating: 6.4/10 (from 64 votes)
Language: EN
Seasons: 2
Total Episodes: 13
Network: NBC
Genres: Sci-Fi & Fantasy, Drama, Action & Adventure
Production Companies: Solow Production Company
Synopsis
Atlantis survivor Mark Harris breathes underwater, withstands extreme depth pressures and wields superhuman strength.
Cast

Patrick Duffy
Mark Harris

Belinda Montgomery
Dr. Elizabeth Merrill

Alan Fudge
Dr. Crawford

Jean Marie Hon
Jane