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

Cándida is an lowly maid in Madrid, where she scrapes to get by and help her two useless sons, a junkie and a basket case. As her family situation goes from bad to worse, her travails inspire other people

After a frenetic persecution, a prehistoric hominid (Moha) faces an elder man (Wan) and his dog-hyena (Khana), with an unexpected outcome, where nothing is as it seems.