While Bob, Wendy, Scoop and Lofty build a lifeguard tower for Brad Rad, Muck and the others are happy to build sandcastles. Bob then realizes that the lifeguard tower needs a foundation made out of boulders so he calls Muck in on the job. Muck is determined to be able to do both her job and build the castle. Sent to the Supplier's Yard, Muck picks up some extra boulders to use in the foundation when she has a chance to build her castle. But it's only when Bob and Brad stop work to redesign the tower that Muck is able to try to build her best castle ever! Muck mistakenly thinks she must have put her extra boulders in the lifeguard tower foundation and so takes some out to build her castle with. When Brad tries out the finished tower, it tips over! It's now that Muck realizes her mistake but she knows how to fix the mess! She demolishes her castle and uses the wood and extra boulders to build a ramp for Lofty to rescue Brad. Well done, Muck! Air Date: May 4, 2010