Mark starts his college career, Debbie struggles with personal trauma, and Allen the Alien returns home to find a new threat facing the Coalition of Planets.

Mark takes a stand, unaware of the ramifications for his family, the GDA, and even the Guardians. Cecil remembers his past and Eve makes an important decision.

Mark struggles to teach Oliver what it means to be a superhero. Debbie explores a new relationship and a changed family dynamic.

A powerful new figure challenges Mark's idea of what's right and what's wrong. Rae approaches Rex with a big life decision.