After "Peyton Place", Nelson worked in many more productions of all varieties. He teamed with former "Peyton Place" co-star Percy Rodriguez in the television series "The Silent Force", which ran for 15 episodes in 1970–1971. He guest-starred with David Janssen in "The Fugitive" in 1963, and appeared as a different character later in the series. Subsequently, Nelson had guest-starring roles on many of the popular dramas of the 1970s and 1980s, including "Marcus Welby, M.D.", "Cannon", "O'Hara, U.S. Treasury", "Night Gallery", "Banacek", "Alias Smith and Jones", "Mod Squad", "", "The Streets of San Francisco", "Kung Fu", "The F.B.I." (in 3 different roles), "Adam-12", "Ironside", "Police Woman", " Medical Center" (3 roles), "The Bionic Woman", "Gibbsville", "McMillan and Wife", "Dallas", "The Rockford Files" (2 roles), "Barnaby Jones" (2 roles), "Charlie's Angels", "Lou Grant", "Trapper John, M.D.", "Vega$" (2 roles), "CHiPs", "Quincy M.E.", "Matt Houston", "The Fall Guy", "Dynasty", "Cagney & Lacey", "MacGyver", "Jake and the Fatman" (2 roles), and "Murder, She Wrote" (5 roles).