Valor y... ¡al toro!

Mortadelo and Filemón will have to face each other with a huge brave bull whose horns hide what they need to find. Mortadelo and Filemón must recover the plans of the Bartolo project. Those planes have been stolen from the Argonáuticas Research Center of the cosmos by the Rata gang, made up of El Rata, Tapia and Higo Chumbo and their leader, Doctor Apolonio. This band will try to leave the City on board the liner Ile du Soria. Mortadelo and Filemón will embark on the ocean liner to try to recover those planes. What they do not know is that the plans have been hidden in the horn of a huge brave bull that will give problems throughout the adventure.