[citation needed] In the late 1950s, Bast adapted Jean Giraudoux's play Tiger at the Gates for Granada Television, and wrote scripts for the BBC and ITV.

Back in the States he wrote episodes for Combat!, Perry Mason, Ben Casey, The Outer Limits, Alfred Hitchcock Presents, Honey West, and Dr. Kildare, among other series.

[8] In 1976, he received the Mystery Writers of America's Edgar Allan Poe Award for his television movie The Legend of Lizzie Borden with Elizabeth Montgomery in the title role.

In 1977, his adaptation of Alexandre Dumas, père's The Man in the Iron Mask, starring Richard Chamberlain in a dual role, received two Emmy nominations for Bast's script and Olga Lehmann's costume designs.

He also collaborated with Huson, writing and producing a variety of television movies and series, including Tucker's Witch, The Hamptons, Pursuit, The Big One: The Great Los Angeles Earthquake, Deadly Invasion: The Killer Bee Nightmare, Power and Beauty, and The Fury Within.