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. Both the film and the series were set in the near-future of the 1970s and 1980s, with the series generally using dates between 1973 and 1984. Since this era was depicted from the vantage point of a decade earlier, their version of the decade obviously differs considerably from the one that actually took place.