While investigating a "monster" at the creek, the kids discover something even scarier: tons of yucky trash! Can they build a machine to clean it all up?

NASA thinks there might be a ninth planet on the edge of our solar system, and Ada and her friends are determined to help them find it!

Iggy promised Bee-Bee he'd build her a tea party palace for a playdate with new friends. But there's a problem: He can't remember where his plans are!