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Lockwood's two series came early in his career, and each lasted only a single season. ABC's Hawaii-set Follow the Sun (1961–62) cast him in support of Brett Halsey and Barry Coe, who played adventurous magazine writers based in Honolulu.
Lockwood was Eric Jason, who did the legwork for their articles, but
his on-screen time was limited since most of the plot focused on Halsey
or Coe. In the story, Lockwood was said to have been born on December
7, 1941 (Pearl Harbor Day), but he was actually born nearly five years earlier.
On November 12, 1961, Lockwood appeared as a rodeocowboy named Bo in love with an 18-year-old singer, Cherie, played by Tuesday Weld in ABC's Bus Stop. The 26-week series starred Marilyn Maxwell as the owner of a diner in fictitious Sunrise, Colorado. Bus Stop aired a half-hour after Follow the Sun. Thereafter, he starred with Jeff Bridges in the acclaimed "My Daddy Can Beat Your Daddy" episode of CBS's anthology series, The Lloyd Bridges Show.
Shortly afterwards, Lockwood starred in another NBC television series called The Kraft Mystery Theater, also known as Crisis, in an episode titled "Connery's Hands". He was cast opposite Sally Kellerman, with whom he would again appear in the second Star Trek pilot, which was not originally aired as such, called "Where No Man Has Gone Before",
as Helmsman Gary Mitchell, and Kellerman as the ship's psychiatrist Dr.
Elizabeth Dehner, who both develop super powers after being jolted and
knocked unconscious by an unknown electrical force. This episode was
originally produced in 1965, but not screened for a year.
In 1966, Lockwood guest starred as Clint Bethard in the episode "Reunion" of ABC's The Legend of Jesse James, starring Christopher Jones in the title role. That same year, Lockwood appeared as Danny Hamil on the episode "Day of Thunder" of NBC's drama, The Long Hot Summer, based loosely on the works of William Faulkner. He appeared twice in 1966 as Jim Stark in the two-part episode "The Raid" of CBS's Gunsmoke with James Arness.
He co-starred with Stefanie Powers (his wife at the time) in an episode of ABC's Love, American Style as a newlywed who gets his mouth stuck around a doorknob. In 1983 he made a guest starring role in the series Hart to Hart starring Robert Wagner, and [now his ex-wife] Stefanie Powers. It was from Season 4, called "Emily by Hart".
Between 1959 and 2004, Gary Lockwood had roles in some forty
theatrical and made-for-TV features and made almost eighty TV guest
appearances, including several as a villain on CBS-TV's Barnaby Jones starring Buddy Ebsen.