During his time in the United States, Pate became an acting instructor and lecturer, and wrote many screenplays and plays for American films and television series, including Rawhide ("Incident of the Power and the Plow" with Dick Van Patten) and Most Dangerous Man Alive ("The Steel Monster"). In 1959, he returned briefly to Australia, where he starred in a television presentation of Tragedy in a Temporary Town, shown as part of the Shell Presents anthology drama series. After that project he returned to the United States for another eight years, during which time he enjoyed a successful career as a television character actor, appearing repeatedly on programs such as Gunsmoke, Sugarfoot, The Texan, The Rifleman, Branded ("Call to Glory"), Daniel Boone, The Virginian, Perry Mason ("The Case of the Skeleton's Closet" and "The Case of the Wednesday Woman"), Batman (episodes 45 "The Clock King's Crazy Crimes" and 46 "The Clock King Gets Crowned"), Mission: Impossible ("Trek"), The Man from U.N.C.L.E. ("The Foreign Legion Affair"), Get Smart, Rawhide ("Incident of the Power and the Plow", "Incident at Superstition Prairie", "Incident of the Boomerang", and others), Voyage to the Bottom of the Sea, and Wagon Train. In the 1963 movie PT 109, he played the part of Arthur Reginald Evans, the Australian coast watcher who helped rescue John F. Kennedy and his crew. That role was of the few occasions when Pate played an Australian while working in the United States.