Sam and Mark continue their search to find the world's next great superhero. Seven superheroes remain in the lair.

Dr Dark gets dangerously close to the superheroes. The evil Supervillain captures Sam and Mark and locks them up in the control room. The only way for the superheroes to save them is by answering Dr Dark's riddles to get the secret code to unlock the control room door. But will they work well as team? And more importantly, can they crack the code before Dr Dark's mega laser beam reaches Sam and Mark?

Plus, the superheroes head off to the Newsround studios to warn the nation about their arch-nemesis. But how will they get on at the famous BBC Television studios? Will they remain superhero-like at all times? Will they remember that a superhero is never off duty? Hidden cameras in the makeup room reveal what the superheroes talk about when they think no one is watching.

And one more superhero will be chosen to power down, return back to their secret identity and leave the lair for good. Show less