Jeffrey Hunter was the lead character in the original pilot for which successful series?

Jeffrey Hunter (born Henry Herman "Hank" McKinnies Jr.; November 25, 1926 – May 27, 1969) was an American film and television actor and producer known for his roles in films such as "The Searchers" and "King of Kings". On television, Hunter was known for his 1965 role as Capt. Christopher Pike in the original pilot episode of "Star Trek" and the later use of that footage in "The Menagerie".

Hunter accepted the lead role of Captain Christopher Pike in "The Cage", the first pilot episode of "Star Trek". Clegg Hoyt, Hunter's co-star in "The True Story of Jesse James", appeared in this pilot as Pitcairn, the transporter chief of the USS Enterprise.

Hunter declined to film a second "Star Trek" pilot requested by NBC in 1965, and decided to concentrate on motion pictures. He told the press, "I was asked to do it, but had I accepted, I would have been tied up much longer than I care to be. I have several things brewing now and they should be coming to a head in the next few weeks. I love doing motion pictures and expect to be as busy as I want to be in them." Footage from the original pilot was subsequently adapted into a two-part episode titled "The Menagerie".