Admiral Harriman Nelson was a fictional character first played by Walter Pidgeon in the 1961 science fiction film, Voyage to the Bottom of the Sea, and later played by Richard Basehart in the 1964-1968 ABC television series of the same title.
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She also made appearances on television shows like Hawaii Five-O, Hogan's Heroes, Voyage to the Bottom of the Sea, Mannix, and The Man from U.N.C.L.E..
However, he is probably best remembered for his prolific work on the Irwin Allen TV series Lost in Space, The Time Tunnel, Voyage to the Bottom of the Sea and Land of the Giants.
The Magnetic Monster marked Carlson's initial foray into sci-fi and horror and he would follow it with several better known titles that would forever associate him with that genre: It Came from Outer Space (1953), The Maze (1953), Riders to the Stars (1954), Creature from the Black Lagoon (1954), and such TV series as Thriller and Voyage to the Bottom of the Sea.