The Grayson household is upended when Mark returns to Earth with surprising new responsibilities. The Guardians of the Globe face dangers both at home and away.

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

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.