Space Cadets

The entire Space Cadets series (ACE 1 - 4): Two hundred years ago, aliens came to earth. They abducted millions of people and then told the rest that they were going to evaluate humanity over the course of the next several hundred years. If the earthlings didn't measure up to their standards, they'd be back to eliminate them. So guess what humanity has done since then: They geared up for war. Jack Peterson is a cadet, just a year away from graduating from the academy. When his class goes on a field trip to a war ship, events unfold that will change his life forever.