From the back of the book... Palladium Books Presents: Aliens Unlimited Includes Rifts conversion notes. Adaptable to Rifts. Mechanoids, and Rifts Dimension Book. > Over 100 specific alien races and monsters! > Random alien creation tables and rules. > New super powers, bionic and skills. > High-tech weapon and equipment. > Spaceships and creation rules. > U.F.O. watch groups. > Secret Organizations and spies. > Rifts conversion notes. Adaptable to Rifts, Mechanoids, Rifts Dimension Book Two: Phase World and the entire Palladium Megaverse. > Enough ideas and information to create dozens of campaigns. > Written by Wayne Breaux and Kevin Siembieda.