Beregi had a major recurring role as gangster Joe Kulak on The Untouchables.

He played the starring role as former Nazi Gunther Lutze in the Twilight Zone episode "Deaths-Head Revisited" and was featured in two other Twilight Zone episodes, "The Rip Van Winkle Caper" and "Mute".

He appeared in other contemporary television shows as well, including Thriller, Hogan's Heroes (twice), The Monkees, The Man From U.N.C.L.E., Blue Light, Don't Call Me Charlie!, The Wild Wild West, Batman, Mission: Impossible, Get Smart, Green Acres, Bat Masterson (as a magician), and in an episode of The Lucy Show which featured Hogan's Heroes stars Bob Crane and John Banner.

Beregi's film career included small roles in several major films, including Judgment at Nuremberg (1961), The Incredible Mr. Limpet (1964), My Fair Lady (1964), Ship of Fools (1965), Everything You Always Wanted to Know About Sex* (*But Were Afraid to Ask) (1972) and Young Frankenstein (1974).

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