The third TV movie leading up to the short lived series; this one, again, suffers from not enough material to stretch to feature length. There’s a bit of “Invasion of the Body Snatchers” here as the sci-fi aspect is put front and center but this seems better suited to the hour (i.e. 48 mins) long format of weekly episodes.
It was short and sweet; 4 films and 13 episodes and the Man from Atlantis vanished. Patrick Duffy hit it big in „Dallas“ but his interest with the character persisted and the actor published a novel in 2016 where he covered his origins. Duffy explained that if the novel would sell in large numbers he would be interested in doing a trilogy about this aquatic man who‘s possibly from Atlantis.