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) and sea monsters. The season ended with the "Seaview" crew fighting a foreign government to save a defense weapon. The first season included gritty, atmospheric story lines devoted to Cold War themes and excursions into near-future speculative fiction. Many episodes involved espionage and sci-fi elements. Aliens, sea monsters and dinosaurs were featured, but the primary villains were hostile foreign governments. While fantastic, the scripts had a semblance of reality. During the course of the first season, Nelson was promoted from a three-star to a four-star admiral. It was also established that while essentially a marine research vessel, SSRN "Seaview" was