Ricky Ricotta's Mighty Robot vs. the Naughty Nightcrawlers from Neptune (Ricky Ricotta's Mighty Robot '8), Paperback

Ricky Ricotta and his Mighty Robot are in for a sticky, slimy surprise
Ricky and his Mighty Robot have built the coolest fort Squeakyville has ever seen, and they can't wait for the fun to beginBut then Cousin Lucy arrives with her pets and plans to turn it into a princess castle -- what a party pooper
Things completely fall apart when Nimrod Nightcrawler, a wicked worm from the planet Neptune, digs a tunnel under Ricky's fort, trapping the Mighty Robot. Now it's up to Ricky and Lucy to put a stop to this nightmare -- and save their friend