Updated: October 14, 2023

In 1959, after just three weeks in Hollywood, he landed a role in the CBS Four Star Television series Johnny Ringo, having played the character of Cully, the deputy. At this time, he changed his name to Mark Goddard at the suggestion of his friend and mentor, Chuck Connors. He was also signed for a role lasting 3 years in the TV show The Detectives, another Four Star-produced hit series which ran on ABC and NBC from 1958-61, and starred movie actor Robert Taylor, along with actors Tige Andrews, Russell Thorson, and Goddard as Detective Chris Ballard. In 1963, Goddard appeared as Roy Mooney in the Perry Mason episode 180, "The Case of the Potted Planter." He was featured in the 1965 film A Rage to Live.

From 1964-1965, Goddard starred in another one-season CBS series, Many Happy Returns, in which he portrayed Bob Randall, the young husband of Joan Randall, played by Elinor Donahue, formerly of Father Knows Best and The Andy Griffith Show. The program starred John McGiver (1913-1975) as the head of the complaint department of a fictitious Los Angeles department store. Elena Verdugo and Mickey Manners were also in the cast. Goddard's next role was for the three seasons of the CBS television series Lost in Space (1965-68), playing Major Don West.