Tartarin is the local hero in the small provincial town of Tarascon. He shows off about imaginary adventures in Africa, where he has never been, as a Lion Hunter, which he is only in his imagination. But one day he becomes a real hero...

From the American psychiatric hospital run by two maniac, confident that he was a spy, and a transsexual. Very soon they will want to return to their native madhouse — but it will be too late. Because the third psycho sent them on a secret mission to Russia. Yes, even in a balloon.