Sam and Mark travel to Hollywood to meet superhero godfather Stan Lee.
Thirteen wannabe heroes move into the top secret lair, hidden away in the heart of London.
The team must cross a plank suspended 18 metres above the ground.
The Superheroes help a VIP damsel in distress: Dani Harmer aka Tracy Beaker.
The superheroes are on a crime-fighting mission, facing supervillain Dr Dark.
The superheroes try to foil Dr Dark's plan to contaminate the city with radioactive waste.
The ten remaining superheroes try to foil Dr Dark's fiendish plan to control the airwaves.
The nine remaining superheroes discover that their secret identity files have been stolen.
The Superheroes are sent to Dr Dark's lair to rescue the animals he stole from a pet shop.
The superheroes must rescue Sam and Mark, who have been captured by the evil Supervillain.
Dr Dark attempts to contaminate the city's water supply.
Dr Dark's plans to unleash a giant spider on London - can the superheroes stop him?
It's time for the four remaining superheroes to face Dr Dark's henchmen for the last time.
The final three superheroes remain in the lair to battle it out to win superhero glory.
Sam and Mark are at the end of their epic journey to find the world's greatest superhero.