Bobo is behaving responsibly. This alarms Rex. While others are more accepting of Bobo's change, Rex is determined to find out what happened to his friend. An Evo Bunny is captured, and will soon give birth.
In the middle of a battle, Rex suddenly produces new builds. As he's being examined, a mysterious stranger arrives who claims to be Rex's brother - Caesar. He claims to have sent the schematics for the builds.