Nelson was cast in episodes of such other westerns as Maverick, Wagon Train, Black Saddle, Have Gun – Will Travel, The Rebel (five times), Johnny Ringo, Gunsmoke, Tombstone Territory, Laramie, Bonanza, Stoney Burke, The Dakotas, "The Rifleman" and Redigo. He appeared on drama and adventure series too, such as Combat!, The Fugitive, The Twilight Zone, Flight, The Silent Service, The Outer Limits, Harbor Command, Tightrope, The Blue Angels (as the arrogant FLIGHT instructor Lieutenant Dayl Martin in "The Jarheads"), COronado 9, The Eleventh Hour, Thriller, and Channing, an ABC drama that romanticizes college life. He guest starred on Mission: Impossible and Jackie Cooper CBS military sitcom/drama, Hennesey.