Aidman guest-starred on the NBC children's western Fury in episodes of the ABC/WB crime drama Bourbon Street Beat, and in the syndicated aviation adventure series Whirlybirds. He appeared from 1959 to 1960 in different roles in three episodes of the syndicated crime drama U.S. Marshal. Aidman made a guest appearance on the CBS courtroom drama Perry Mason in 1960 as murderer Arthur Siddons in "The Case of the Gallant Grafter." Aidman also guest starred in a 1961 episode of the western TV series Bonanza ("The Rival") as Jim Applegate.
In 1961, in a Peter Gunn episode entitled "Witness in the Window", Aidman hires Peter Gunn to investigate a woman blackmailing him over alleged sexual improprieties he denies.
In "Shadow of the Past" (October 7, 1961) of the NBC western series The Tall Man, Aidman is cast as Ben Wiley, the father of Sue Wiley, the latest girlfriend of Billy the Kid.
Aidman was cast as George Ellsworth, an official with the United States Embassy in Warsaw, Poland, in the three-part 1963 episode "Security Risk" of the CBS anthology series GE True. He also played a sex education teacher in an episode of Slattery's People, "Do The Ignorant Sleep in Pure White Sheets"?
He appeared on another NBC western series, The Road West, in its 1966 episode "The Lean Years." That same year Aidman played a scientist who turned into a werewolf in an episode of Voyage to the Bottom of the Sea. He then guest-starred on CBS's The Wild Wild West in a recurring role for several episodes during the series' fourth season as Jeremy Pike, one of Jim West's substitute sidekicks.[4] In 1968 he appeared in ABC's The Invaders as research scientist Julian Reed in the episode "The Pit".
In 1970, Aidman appeared in Hawaii Five O as Dr. Royce, and in 1974, he introduced the character Louis Willis (later known as Tom Willis), father-in-law-to-be of Lionel Jefferson, on the February 1974 episode of CBS's All In The Family, "Lionel's Engagement". He also played a teacher in an episode in the sixth season of The Andy Griffith Show and made two guest appearances on The Dick Van Dyke Show.
Aidman played the father of Elmer Dobkins in an episode of Little House on the Prairie and appeared in an episode of the 1974 police dramaNakia. Three years later, he portrayed a memorable character in an episode of M*A*S*H, "The Grim Reaper," playing Colonel Bloodworth, a callous, sadistic commander who takes pleasure in predicting casualties and reducing his troops to statistics. Later, from 1985 to 1987, Aidman was the original narrator for the revival of The Twilight Zone series until he was replaced by Robin Ward.