Monica, the leader of the crew and 'ruler of the street,' is a little girl with a strong personality, not one to overlook any insult. She absolutely loves her stuffed bunny, Samson, and takes him with her everywhere. Jimmy Five, one of her best friends, is a smart kid, but he's always provoking her. Maggy is Monica's best friend and a super cute girl, who is always eating watermelons. To complete the show's main quartet, enter Smudge, a skillful boy who is terrified of water.

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Embarking on a whimsical adventure, Monica and her friends take center stage in four captivating tales. The first, "O Plano Infalível," showcases Jimmy Five's latest scheme to defeat Monica and her indomitable bunny companion. In "Um Amor de Ratinho," Monica attends a costume party dressed as a mouse, unaware that a small mishap would awaken a genuine mouse's affectionate feelings towards her. The third story, "A Ermitã," sees Monica bid farewell to her friends, venturing alone into the heart of the forest to live an independent life. Lastly, in "O Império Empacota," Jimmy Five's courage and true affection for Monica are unveiled when he fearlessly engages in an interplanetary battle against aliens, all in an effort to save his beloved big-toothed friend.

The first short featuring Monica and Friends. It introduced the song "Feliz Natal pra Todos", which has now become an iconic Christmas theme to the gang. In the special, Monica, Jimmy Five, Smudge, and Angel decide to build a chimney to wait for Santa Claus.