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.

Mark Grayson is back and stronger than ever – with new enemies out for blood and old villains out for revenge.

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.

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.