Tim Hopper

as Gene Baptiste

as Dr. Max Simonson

as Vaanwyck (2 episodes)

as Dan Kitzmiller

as Admiral

as Narrator (voice) (20 episodes)

as Fisherman

as Superintendent Jaffey (2 episodes)

as Tommy

as Ken Gallagher (1 episode), as Captain Tom Van Meter (1 episode)

as Jeff Paul

as Dr. Steve Calhoun (3 episodes)

as Hunk Swindell (1 episode)

as Sanford Prince (4 episodes)

as Ken Rowe (1 episode), as Captain Tom Van Meter (38 episodes)

as Adolphus Greely (voice)

as Carl Patrick (1 episode)

as Uncle Gary (1 episode)

as Michael Catalani (1 episode)

as Principal Gil Carruth (1 episode)

as Dan Komenko

as Bill Huxley

as Dustin Klein (1 episode)

as George Gibson (2 episodes)