In early 1948, he was selected by Elia Kazan to be a member in the recently formed Actors Studio. Balsam went on to perform in several episodes of the studio's dramatic television anthology series, broadcast between September 1948 and 1950. He appeared in many other television drama series, including Decoy with Beverly Garland, The Twilight Zone (episodes "The Sixteen Millimeter Shrine" and "The New Exhibit"), as a Psychologist in the pilot episode, Five Fingers, Target: The Corruptors!, The Eleventh Hour, Breaking Point, Alfred Hitchcock Presents, The Fugitive, and Mr. Broadway, as a retired U.N.C.L.E. agent in The Man from U.N.C.L.E. episode, "The Odd Man Affair", and guest-starred in the two-part Murder, She Wrote episode, "Death Stalks the Big Top". He also appeared in the Route 66 episode, "Somehow It Gets To Be Tomorrow".