When Cotterpin Doozer hears that Gobo is the bravest Fraggle in the Rock, she gets him to help her find the Cavern of Lost Dreams, which is where the original tower was built. When they get there, the remaining two Doozers, Yeaster and Crusty, don't want to come back. Will these two Doozers finally accept the changes that have occurred and move back to the Rock and help build once again?
