The film chronicles Perceval's knighthood, maturation and eventual peerage amongst the Knights of the Round Table, and also contains brief episodes from the story of Gawain and the crucifixion of Christ.
The story is based around "spermulites", the alien inhabitants of a dying planet. The only way they can save their planet is by sucking the men of planet earth dry of sperm, kind of like horny vampires.
Paul and Sarah form a happy couple with no problems. But when Sarah sees Paul wrapped in the arms of a young woman her peaceful happiness collapses. She in turn takes a lover. Paul realizes that he's losing his wife and proposes a second honeymoon in Morocco...