Alien Force Episodes -

The Highbreed invasion reaches its climax, followed by the return of an ancient enemy.

The first two seasons are defined by a cohesive, overarching plot regarding the , a xenophobic race obsessed with genetic purity that seeks to "cleanse" the universe of "lesser" life forms. The Premiere: The series begins with the two-part episode " Ben 10 Returns alien force episodes

If you are short on time, watch these key episodes to understand the full story: The Highbreed invasion reaches its climax, followed by