Inspired by I Spy Fantasy, Hillary ventures to the castle, underwater and outer space to solve riddles and wins dungeon keys, book pages and crystal orbs for the rocket ship and then finds ingredients to make a magic potion to fight the dragon and save the princess, finds shells to find treasure and finds metal objects to fix the circuit board, and then finally launches the rocket ship, with the help from her new friends, Archibald Asparagus, SpongeBob SquarePants and the Blaster Pals, Blastronaut, Spot and Galactic Commander.