Misunderstandings threaten to ruin the Monster's (el Monstruo) birthday. The Girl (Niña), Salsa and the Chef (Chef Loco) are busy making a cake for the Monster when he drops into the pizza parlor for a visit. Not wishing to spoil the surprise, they quickly disappear. Next he pays a visit to Baby Bear (Bebé Oso), who, together with Little Rat (Ratoncito), is wrapping a present for the Monster. They, too, quickly disperse. The Monster's spirits improve greatly when all of the characters throw a surprise party for him. 

Words: contento/contenta, triste (happy, sad)