After gaining attention for "M*A*S*H", Christopher appeared in various other television series, including "Good Times" (as the military doctor examining J.J. Evans) and "Murder, She Wrote", and made multiple guest appearances on "The Love Boat". In 1998, he guest-starred as a priest in an episode of "Mad About You". He also remained active in the theater, including a tour of the United States in the mid-1990s with Farr, performing Neil Simon's "The Odd Couple" on stage. In 2008–2009, he toured with "Church Basement Ladies". One of Christopher's last roles was that of a priest (Father Tobias) on the daytime drama "Days of Our Lives".