Later that same year, Dack Rambo landed the role of Jeff Sonnett on The Guns of Will Sonnett, and co-starred in the short-lived Gunsmoke spin-off, Dirty Sally, with Jeanette Nolan. During the 1970s and 1980s, he made guest appearances on Marcus Welby, M.D., House Calls, Wonder Woman, Charlie's Angels, All My Children, Fantasy Island, The Love Boat, Hotel and Murder, She Wrote. He also acted out the lead role in Sword of Justice, which lasted for ten installments in 1978-79. Rambo may be best remembered on television for playing Jack Ewing in 51 episodes of the soap opera Dallas from 1985-87, although over 60% of the Dallas episodes that Rambo appeared in ended up being explained away as a dream that the character Pamela Barnes Ewing had been having. Rambo also played Wesley Harper on the 1984 short lived TV series soap opera Paper Dolls.