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.

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.

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.