In the movieEdit
Prince Valium is engaged to marry Princess Vespa of Planet Druidia. The princess has to marry a prince, and he somehow became the last prince in the galaxy. (Whether they mean the last single prince, the last living prince, the last prince Vespa had yet to reject seems unclear.) During the wedding, Vespa unshockingly gets cold feet and storms off in her luxury starship.
When Vespa returns to her home planet, Valium is one of the first people to welcome her back. They attend "Take Two" of their wedding, only for Vespa to realize she would rather marry Lone Starr. After Lone Starr reveals that he is a prince, and asks Vespa if she would like to marry him, she pushes Valium aside and accepts.
- Prince Valium is a play on "Prince Valiant", as is named after a well known prescription sleep aid of the same name (which is why he can't seem to stay awake).