King's Quest VI: Heir Today, Gone Tomorrow

King's Quest VI is universally known as the high point of the series for its in-depth plot, its landmark 3D graphic introduction movie, and its great voice acting, with actor Robby Benson providing the voice for Alexander, the game's protagonist.

Prince Alexander can't get Cassima (Mordack's slavegirl he met during his imprisonment in King's Quest V) out of his mind. The Mirror sends him a vision of her, and Alexander manages to reach her land by ship. He learns that she is destined to be married to the evil Vizier Abdul Alhazred of the Green Isles by force. In the optimal game route, Alexander travels to land of the dead to free Cassima's dead parents who were killed by the Vizier. Alexander must also finally stop the wedding and free Cassima.