Earth Attack! is the twentieth book in the Astrosaurs series, notable for the fifth appearance of Teggs' archenemy, General Loki the velociraptor, as well as the first appearance of the planet Earth. The artwork features Teggs and Loki confronting one another over a backdrop of Earth. Earth Attack! is longer than the astrosaurs books 1 to 19, and it includes the first Astrosaurs Academy story: Destination: Danger! in a few ones. It could be a reason that this book was longer.