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) a yellow, two-man mini-submarine with passenger capacity, armed with a laser gun. It could leave the ocean and function as an airplane. The "Flying Sub" was referred to by the initials "FS-1". The futuristic craft greatly increased the "Seaview" crew's travel options. It was launched from a bay with automatic doors added in the lower part of the bow section of "Seaview" that was apparently built between Seasons One and Two. The "Seaview"'s private observation deck from the first season was never seen again. The ship's eight smaller observation windows became four large windows giving the sub a sleeker, more