Films:
* The Picture of Dorian Gray (1945): This was his breakout role, playing the titular Dorian Gray. The film solidified his image as a leading man and earned him an Academy Award nomination for Best Supporting Actor.
* The Strange Door (1951): Another notable film, this time playing the role of a Roman nobleman who finds himself trapped in a mysterious house.
* The Egyptian (1954): Hatfield plays the role of a jealous Egyptian prince.
* The Scarlet Hour (1955): A thriller where he plays a man suspected of murder.
* The Mole People (1956): A science fiction film featuring Hatfield as a scientist exploring a subterranean world.
* The Incredible Shrinking Man (1957): He played the role of a psychiatrist in this classic science fiction film.
* The Story of Ruth (1960): Hatfield played the part of Boaz, a landowner who takes Ruth under his protection.
Television:
* Alfred Hitchcock Presents (1956-1960): Hatfield made multiple guest appearances on this iconic television series, showcasing his versatility in various roles.
* The Twilight Zone (1961): He appeared in an episode titled "The Shelter," playing a man seeking refuge during a nuclear attack.
* The Untouchables (1961): Hatfield appeared in several episodes as different characters.
* Wagon Train (1961-1965): He made guest appearances on this popular Western series.
* The Virginian (1962-1971): Hatfield was a recurring character as Judge Garth, appearing in multiple episodes.
* The Man from U.N.C.L.E. (1964-1968): He played a variety of villains on this popular spy series.
* Batman (1966): Hatfield had a memorable role as the villain "The Bookworm" in this campy superhero series.
* Hawaii Five-O (1968-1980): He appeared in multiple episodes of this crime drama series.
He was a prolific actor who appeared in numerous other films and television programs, demonstrating his talent across a range of genres.