Mark Dempsey
Mark Dempsey  was an actor who played the Air Force captain in the  first season episode . He filmed his scene on Monday  at Desilu Stage 10.

Dempsey was born as Herbert L. Dempsey in West Hollywood, California and played regular roles in stage plays beside his on-screen appearances.

Among his acting resume are the films Valley of the Dragons (1961, with Gil Perkins), Palm Springs Weekend (1963, with Bill Mumy, Nick Dimitri, and Judi Sherven), Oh, Calcutta! (1972), The Prodigal (1983), and To Cross the Rubicon (1991, with Billy Burke). He also guest starred in television series such as G.E. True (1962), Hawaiian Eye (1963, with Joan Marshall), 77 Sunset Strip (1963), Perry Mason (1964, with John Harmon), and Bergerac (1989).

He died on 4 April 1994 in Seattle at the age of 58.

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Performers
TOS performers