(1949) then starred in Arthur Lubin's Impact (1949). Television He appeared on television in The Chevrolet Tele-Theatre, and made two films for Universal-International, Shakedown (1950) and Kansas Raiders (1950) (playing William Quantrill opposite Audie Murphy's Jesse James). He did Pulitzer Prize Playhouse on TV, then went to Republic for Fighting Coast Guard (1951), Ride the Man Down (1952), Hoodlum Empire (1952) and Woman They Almost Lynched (1953); then filmed Slaughter Trail (1952) for RKO. In 1952 he produced and starred in a TV series, Dangerous Assignment, which he had performed on radio from 1949 to 1954. Donlevy focused on television: Robert Montgomery Presents, The Motorola Television Hour, Medallion Theatre, Star Stage, Climax!, Damon Runyon Theater, Kraft Theatre, Studio One in Hollywood, Crossroads, The Ford Television Theatre, The DuPont Show of the Month and Lux Video Theatre. After a supporting role in The Big Combo (1955), Donlevy appeared in the British science-fiction horror film The Quatermass Xperiment (called The Creeping Unknown in the US) for Hammer Films, in the lead role of Professor Bernard Quatermass. The film was based on a 1953 BBC Television serial of the same name. The character had been British, but Hammer cast Donlevy in an attempt to help sell the film to North American audiences. Quatermass creator Nigel Kneale disliked Donlevy's portrayal, referring to him as "a former Hollywood heavy gone to seed". Nonetheless, the film was a success, and Donlevy returned for the sequel, Quatermass 2 (Enemy From Space in the US), in 1957, also based on a BBC television serial. It made him the only man to play the famous scientist on screen twice (although Scottish actor Andrew Keir later played him both on film and radio). In between the films, Donlevy was in A Cry in the Night (1956). He had the lead in a "B" western, Escape from Red Rock (1957) and a supporting part in Cowboy (1958). He announced that he had formed his own production company for whom he would make a western, The Golden Spur, but it appears to have not been made. He guest-starred on TV in Rawhide, Wagon Train, Hotel de Paree, The Texan, The DuPont Show with June Allyson, Zane Grey Theater, and The Red Skelton Hour, had supporting roles in Juke Box Rhythm and Never So Few (both 1959), and had the lead in Girl in Room 13 (1960). He toured on stage in a