While filming an advertisement, some extreme sports enthusiasts unwittingly stop a group of terrorists.

12-year-old Florian and his beloved dog Lassie live in an idyllic village in the German countryside. When Florian's father loses his job, the family have to move into a small apartment where there are no dogs allowed. Lassie is given away to another family, but Florian and Lassie yearn to be reunited again so Florian sets out on an adventure to find his best friend.

A group of humans arrive on Sirius 6-B to investigate an SOS signal sent out from the planet, which has been supposedly deserted since the destruction of the man-made weapons known as "screamers." Once the squad arrives, they find a group of human survivors eking out an existence in an old military outpost.