Jack Frost is entrusted with the care of a young looking love sprite, Cupid. She is not a naked, chubby cherub like many believe her to be, but a young looking girl with avian features and always placed in the "borderline naughty" list. Because of his failure at eliminating the Guardians, Pitch has set his eyes on Cupid as his newly found muse for vengeance. Now it is up to Jack to make sure Cupid doesn't fall into the wrong hands while trying to make others believe in her. But, does he really want to share Cupid with the kids around them?

After a miserable seventh birthday party, Lola Loud makes a wish but gets way more than she bargained for.