Five primordial aliens have been unleashed from the darkest corner of the galaxy - and they're out to destroy the universe. Only Cosmo, a young boy from planet Earth, has the power to stop them. Recruited by the elite defence organisation G-Watch to defend the galaxy, Cosmo must prove himself and commence battle against the deadliest aliens in space ... Will Cosmo win the fight against Rockhead - the living mountain? A highly-commercial series for younger readers, featuring bonus collector cards that allow the reader to do battle alongside the Alien Invaders characters!