The series centered around the missions of the Los Angeles County Sheriff's Department Emergency Services Detail, but was also short-lived.In 1980, Harmon gained a regular role in the prime time soap opera Flamingo Road, in which he played Fielding Carlisle, the husband of Morgan Fairchild's character.During the mid-1970s, Harmon made guest appearances on shows such as Laverne & Shirley and The Hardy Boys/Nancy Drew Mysteries and had supporting roles in the feature films Comes a Horseman (1978) and Beyond the Poseidon Adventure (1979).
In 1993, he appeared in one episode in the role of a rodeo clown on the CBS comedy/western series Harts of the West with future cast mate Sean Murray, who plays Mc Gee on NCIS.
In 1995, Harmon starred in the ABC series Charlie Grace, in which he portrayed a private investigator.
Despite initially good ratings, the series was canceled after two seasons.
Following its cancellation, he landed the role of Dr.
The series lasted only one season, after which he returned to ensemble medical shows on the series Chicago Hope, in which he played Dr. He also portrayed astronaut Wally Schirra in one episode of the 1998 mini-series From the Earth to the Moon.
In May 2002, he portrayed Secret Service special agent Simon Donovan on The West Wing in a four-episode story arc.
Robert Caldwell on the prestigious NBC Emmy-winning series St. Harmon appeared in the show for almost three seasons before leaving in early 1986 when his character contracted HIV through unprotected intercourse, one of the first instances where a major recurring television character contracted the virus (the character's subsequent off-screen death from AIDS would be mentioned two years later).
In the mid-1980s, Harmon also became the spokesperson for Coors Regular beer, appearing in television commercials for them. Elsewhere in February, he played the lead in the TV movies Prince of Bel Air, co-starring with Kirstie Alley, and The Deliberate Stranger, in which he portrayed the real-life law student turned cross-country serial killer Ted Bundy.
One of his first national TV appearances (other than as an athlete) was in a commercial for Kellogg's Product 19 cereal with his father, Tom Harmon, its longstanding TV spokesman.
Thanks to his sister, Kristen's in-laws, Ozzie Nelson and Harriet Nelson, he landed his first job as an actor in an episode of Ozzie's Girls. Producer/creator Jack Webb, who was the packager of both series, later cast Harmon in Sam, a short-lived 1978 series about an LAPD officer and his K-9 partner.
During his very first game for UCLA, he engineered a stunning upset of the two-time defending national champion, Nebraska Cornhuskers.