The first movie he had a role in was Rocky (1976).
His most famous role to date, is that of the Klingon Starfleet officer Worf in Star Trek: The Next Generation and Star Trek: Deep Space Nine. Durring several interviews, he claims to have been interested in the role of Worf due to his playing a nice guy before on Television, and wanted to break away from any stereotyping of him as a "nice guy".
Dorn also appeared in the Christmas movie The Santa Clause 2 playing The Sandman.
Dorn enjoys flying his single engine plane, something he was not permitted to do while in The Next Generation but was apparently able to do after joining the cast of Deep Space Nine.