A criminal produces an uncontrollable laughter to the population and Mortadelo and Filemón will have to stop him.

Karra Elejaldeas Mortadelo / Tía Fulgencia (voice)
Janfri Toperaas Filemón (voice)
Gabriel Chame Buendíaas Jimmy el Cachondo (voice)
Ramón Langaas Filemón en sueños (voice)
Mariano Venancioas El Súper (voice)
Emilio Gaviraas Rompetechos (voice)
Enrique Villénas El Profesor Bacterio (voice)
Berta Ojeaas Ofelia (voice)