« Quand je serai grand » is about the making of a theatre piece - Les Bonnes by Jean Genet, written in 1947 - It relates what happens before and during the creation of this play, from the auditions to the premiere. It's a fake documentary performed by 15 theatre and cinema actors. Through the creation process, we discover the actors' issues, their private lives, their egos, their expectations, their fears, and all that makes the world of theater unique.