It's summer break for Mark and his friends, but supervillains don't take a vacation. Mark is forced to face the consequences of Omni-Man's double life.

After two challenging missions, the Guardians of the Globe struggle to work as a team. Meanwhile, Mark tries to balance his hero duties, personal relationships, and his future as a college student.

As Mark attempts to salvage his personal life, a new villain arrives, presenting Invincible with his greatest challenge yet. Donald grapples with his past.

An old enemy threatens everything Mark holds dear.

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.

Earth's greatest heroes join forces to fight an unimaginable threat.

With the world still reeling, a dangerous stranger arrives - testing Mark to his limits and beyond.