Today is a great day, Marvin will finally meet his girlfriend’s family. He will discover a gallery of characters each more eccentric than the other, in front of Sarah amazed. An exchange of points of view will disentangle a few family tensions.

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.