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.

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

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.

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

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