Javier Laorden

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

A soldier from the 15th century, a university student from the 19th century and a nurse from the present join the secret 'Department of Time', a secret department within the Spanish government with the ability to travel through time. Their mission is prevent changes in history.

Ángela Vidal, the young television reporter who entered the building with the firemen, manages to make it out alive. But what the soldiers don't know is that she carries the seed of the strange infection. She is to be taken to a provisional quarantine facility, a high-security installation where she will have to stay in isolation for several days. An old oil tanker, miles off shore and surrounded by water on all sides, has been especially equipped for the quarantine.