The series follows the underwater adventures of Captain Mark Nemo and his two young assistants, Christine and Robbie, in their nuclear-powered submarine, the Nautilus.
Blond and hunky, Mark travelled the world's oceans doing scientific research, providing assistance to both humans and animals and thwarting evildoers.
Each episode would attempt to convey some information about oceanography or marine biology, and all of the plot lines would be resolved cleanly in five minutes without resorting to much violence.
At times, Captain Nemo reflects the influence of the 1970s environmental movement, but the sometimes serious attempts to convey environmentalist themes are softened by its lighthearted style.
The following are the synopses Magic Shadows Inc. provides in the syndication package for Captain Nemo: Digiview Entertainment has released a total of 48 episodes on DVD in a series of four volumes.