Christopher left New York City for Hollywood to attempt to gain work in television where he guest-starred in several well-known series, including "The Andy Griffith Show", "Death Valley Days", "The Patty Duke Show" and "The Men from Shiloh". He made several appearances on "Hogan's Heroes", and had recurring roles on "Gomer Pyle, U.S.M.C." and "That Girl". Christopher was a student at Harvey Lembeck’s famed L.A. improvisational workshop in the early 1970s during which time he performed improv skits (with two other performers, Carol White and Shelia Bartold, both also Lembeck students) during a January 1972 episode of "The Carol Burnett Show". While the appearance was officially uncredited, he was introduced by Burnett as Bill Christopher.