The Missing Mushlet

So Mushpie can take a break, Mush-Mush, Chep and Lilit offer to look after the Mushies, assuring her that everything will be fine. But a Mushie pops to become a Mushlet and escapes. Our friends find him in Muddler's clutches! Now, they must figure out a way to save the Mushlet and return the other Mushies to their cave before the return of Mushpie.