What two actors were stars of the TV Series Man From U.N.C.L.E?

Answer:
Robert Vaughn and David McCallum

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The Man from U.N.C.L.E. is a television series that was broadcast on NBC from September 22, 1964, to January 15, 1968. It follows the exploits of two secret agents, played by Robert Vaughn and David McCallum, who work for a fictitious secret international law-enforcement agency called U.N.C.L.E. (the United Network Command for Law and Enforcement).

James Bond creator Ian Fleming contributed to the show's creation.

Theme Song with Credits.
You might recognize David McCallum as Dr. Donald "Ducky" Mallard in the series NCIS