Grumbolt is majoring in action! He's finally getting to follow his dreams at Toy Academy, from learning daring maneuvers, to getting paired up with a sidekick! Grumbolt can't wait to find out who his sidekick is... until it turns out that he's the sidekick. And to school bully Rex Everything, no less. This duo will never work. But when a toy named Tempest Boomcloud kidnaps a classmate and steals Rex's van, it looks like Grumbolt and Rex will have...

When Jake Everdale is in danger of being pulled off the basketball team for flunking science class, his wish for help comes true when his Heroes of History action figures of Sir Isaac Newton and Amelia Earhart come to life to lend a hand.