Ricky Ricotta and his Mighty Robot have just finished building the greatest, most spectacular fort that Squeakyville has ever seen. They are completely ready for an afternoon of epic fun, until Ricky's cousin Lucy arrives and insists on turning their rugged fort into a fancy princess castle. Just as the cousins are arguing over their playground, a massive threat emerges from deep underground. The wicked Nimrod Nightcrawler, a terrifying villain from the planet Neptune, has dug a massive tunnel right under their fort. With a sudden collapse, the Mighty Robot is hopelessly trapped in the slimy underground maze. Now, Ricky and Lucy must put aside their differences and team up to stage a daring rescue. Can they defeat the naughty nightcrawlers and save their gigantic best friend? Prepare for an incredibly slimy, out of this world adventure filled with teamwork and bravery.