Lost in Space Wally Cox, Grant Sullivan, Norman Leavitt, Tommy Farrell, Mercedes McCambridge, Lyle Waggoner, Albert Salmi, Royal Dano, Strother Martin, Michael J. Pollard, Byron Morrow, Arte Johnson, Fritz Feld, John Carradine, Al Lewis, Hans Conried, Dennis Patrick, Michael Rennie, Daniel J. Travanti and Michael Conrad. Jonathan Harris, although a permanent cast member, was listed in the opening credits as "Special Guest Star" in every episode of "Lost in Space". Props and monsters were regularly recycled from other Irwin Allen shows. A sea monster outfit that had featured on Voyage to the Bottom of the Sea (TV series) might get a spray paint
Voyage to the Bottom of the Sea (TV series) season of 32 episodes began with Admiral Nelson and the crew of the "Seaview" fighting against a foreign government to prevent a world-threatening earthquake, and continuing with a foreign government destroying American submarines with new technologies in "The Fear Makers" and "The Enemies". The season also had several ocean peril stories in which the "Seaview" crew spent the episode dealing with the normal perils of the sea. Two examples are "Submarine Sunk Here" and "The Ghost of Moby Dick". The season introduced a diving bell and a mini-submarine, and the first episodes featuring extraterrestrials (Don Brinkley's "The Sky is Falling")