Pepe and Valentina are now big brother and sister and they both have the same problem: their baby sister. This unbearable creature screams, cries and has invaded their room! One night, while everyone else is sleeping, Pepe hears a voice coming from his little sister's crib. But she hasn't learned to talk yet - so who could it be? With their hair standing on end, Pepe and Valentina discover that the cuddly toys are planning a HUGE rebellion. Nothing and nobody can change their minds. Will the SUPERKIDS be able to contain the situation? Will they be able to find a solution to this unexpected mutiny?