Prince Proteus is the tertiary protagonist in the Dreamworks animated feature film Sinbad: Legend of the Seven Seas. The long-time friend of Sinbad, almost sharing a mutual brotherhood relationship, and the ex-fiance of Marina, Proteus was destinied to become the next ruler of the kingdom of Syracuse. However, he was threatened by the goddess Eris, who devised a cunning scheme that it would result in the death of the future ruler and the fall of the marvelous city into glorious chaos. Over the progress of the original film, Proteus was saved by Sinbad, who in return restored Syracuse into it's previous state.
While absent from most of the conflict, Proteus appears in the initial and final events of Heroes vs. Villains War, assisting Sinbad and the other hero forces in their battles against the villains.