 Each episode features a celebrity guest, including Boris Izaguirre, David Bisbal, Alejandro Sanz, Paulina Rubio, and numerous international celebrities such as Miley Cyrus, Sergio Dalma, Ashley Tisdale or Hugh Jackman.Special guests on the show are sometimes involved throughout the episode, including taking part in the various stunts and science experiments.A number of changes to the show, including new segments such as a webcam call-in portion from viewers, were planned for the upcoming format change in the third season, however this segment and some others like training of wild monkeys were removed, the first one due to the amount of time needed and the second one due to low popularity among the audience.