63 books • 18 series
Book #1: Aliens vs. Predator
Book #2: Hunter's Planet
Book #2: Search for Dinosaurs
Book #3: Ship of Ghosts
Book #1: Night of the Living Shark!
Book #6: The Noose Club
Book #3: Space Precinct
Book #1: The Infinite Battle
Book #2: Galactic Warriors
Book #25: Grounded