An old enemy threatens everything Mark holds dear.

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

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.

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.

Mark must prove he's become the hero he's always wanted to be by stopping an unstoppable force.

Feeling lost and confused, Mark looks for advice from Eve. At the same time, everyone's looking for him. 

Mark joins William and Amber on a campus visit to Upstate University, hoping to discover a new future for himself. Debbie makes her own disturbing discovery.

Feeling confident in his new abilities, Mark risks a team-up with a local villain to take down a crime lord, while simultaneously juggling school and a new relationship.

It's two firsts for Mark: a first date and a first trip to another planet. At the same time, Nolan and Debbie revisit their own first vacation together.

Mark has to cut a study date short to help save Mount Rushmore from a crazed scientist. Robot deals with Action - Comic as he assembles a new team of world-saving superheroes. 

With his father out of action, Mark struggles to defend the city against an interdimensional invasion, joining forces with a team of teenage superheroes.

When Mark Grayson finally inherits powers from his superhero father, it's a dream come true. But there's more to being a hero than just choosing a name and costume.