Everyone's favorite super-powered siblings – Alex, Julie, Jack and Katie – join forces with the Armored Avenger to bring down the mega-sized metallic monstrosity known as Ultimo; Marvel's fastest villain, the Speed Demon; and the cryogenic criminal called the Blizzard! Does the action ever end? Not for Marvel's youngest heroes! Someone is using stolen Stark Industries technology to take control of Marvel's most high-tech heroes and villains. Sounds like the perfect time for Power Pack to attend an exhibit of old Iron Man armor! Nothing could possibly go wrong there...right?