Dr Pepper 'unbelievable' by Deutsch LA

Santa Claus, the tooth fairy, the Easter Bunny and a host of other mythical characters desperate to be believed gather in a hall at weekly 'I Exist' meetings.

During the meeting, the newest member, Diet Dr Pepper Guy tells of his woes that he is selling a diet drink that no one believes is truly satisfying.

The spot was created using stop-motion animation, bringing these iconic characters to life.