The Fountain of Smurf. The Smurfs discover a fountain of youth that is guarded by a wicked troll, who steals Papa Smurf's magic book. They convince Gargamel to help them and the greedy villain runs to get the water, but manages to fall in with the troll. As the two chase each other all over the countryside, the Smurfs are able to retrieve Papa Smurf's book.