He produced Dear Wife (1949), then did two more with Leisen: No Man of Her Own (1950) and Captain Carey, U.S.A. (1950) with Ladd. Warwick Films In the 1950s, American producers Irving Allen and Albert R. Broccoli were making action films in the UK under their Warwick Films banner. When Broccoli signed Ladd on for a three-picture deal for Warwick, Ladd insisted on Maibaum co-writing the screenplays. Maibaum moved his family to England in order to do this. The first Warwick Film, The Red Beret (1953) was a bit hit. It was followed by Hell Below Zero (1954). He also began writing for the new medium of television, including short teleplays for The Kate Smith Evening Hour, and the critically acclaimed Emmy nominated "Fearful Decision" starring Ralph Bellamy and Sam Levene which he also co-wrote with Cyril Hume for The United States Steel Hour. Maibaum returned to The University of Iowa in 1954 for one semester to teach and supervise the "Footsteps of Freedom" project, a teleplay writing course. For Warwick, he worked on the war story, The Cockleshell Heroes (1955) which starred Jose Ferrer. Maibaum returned to Hollywood in 1955. He and Hume adapted "Fearful Decision" for the big screen in Ransom! (1956) with Glenn Ford. He co-wrote "Bigger Than Life," (1956) with Hume along with its star and producer, the British actor James Mason. Maibaum did another for Warwick, Zarak (1956), directed by Terence Young and starring Victor Mature. He and Young collaborated on the script for Warwick's No Time to Die (1958) with Mature and he did some uncredited work on Warwick's The Man Inside (1959). He wrote some episodes of Wagon Train (1958) and provided the story for Warwick's The Bandit of Zhobe (1959) and Killers of Kilimanjaro (1959). MGM TV Maibaum became executive producer at M.G.M.-TV in 1958, for whom he wrote and produced the TV series The Thin Man (1957–59). He also produced a pilot for a TV series Maisie (1960), based on the film series, and worked on the script for The Day They Robbed the Bank of England (1960). His strong ties to the Writer's Guild and the writing profession led him to resign in 1960 during a writer's strike. Maibaum wrote and produced a war film for 20th Century Fox starring Audie Murphy, Battle at Bloody Beach (1961). He then was invited by Albert Broccoli to write the first James Bond