Jack Warner, who appeared by arrangement with the J. Arthur Rank Organisation, with whom he was contracted. At the time, he was best known as the star of Here Come the Huggetts (1948) and its sequels. Shortly after finishing The Quatermass Xperiment, he made his first appearance on television in the role he is most associated with: the title character in Dixon of Dock Green (1955–76). Warner plays Lomax in a lighthearted fashion and there is a running joke in the film involving Lomax's futile attempts to find the time to have a shave with his electric razor. Richard Wordsworth was cast by Val Guest as the hapless Victor Carroon because "he had the right sort of face for the part". He was best known at the time for his work in the theatre. His performance in The Quatermass Xperiment is frequently compared with that of Boris Karloff in Frankenstein (1931). Guest, aware of the risk of an actor going over the top with the part, directed Wordsworth to "hold back just a mite of what you're feeling". Summing up Wordsworth's performance, film critic Bill Warren said, "All Carroon's anguish and torment are conveyed in one of the best mime performances in horror and science fiction films... A sequence in which he is riding in a car with his wife is uncanny: only the alien is visible for a long moment". Wordsworth went on to appear in three more Hammer films: The Camp on Blood Island (1958), The Revenge of Frankenstein (1958), and The Curse of the Werewolf (1961). He remained known predominantly as a stage actor, among other things devising and starring in a one-person show dedicated to his great-great grandfather, the poet William Wordsworth. Another American star provided by Robert L. Lippert was Margia Dean, who played Judith Carroon. A former beauty queen, Dean was allegedly cast on account of her association with the 20th Century Fox president, Spyros Skouras. According to executive producer Michael Carreras, "Skouras had a girlfriend who was an actress and he wanted her in pictures, but he didn't want her in pictures in America, because of the tittle-tattle or whatever, so he set it up through his friend Bob Lippert". Val Guest recalled of her, "She was a sweet girl, but she couldn't act". Her American accent was considered out of place in the film, and so her lines were dubbed in post