The Chameleon wants to give Maximus something he's always wanted for Christmas-the destruction of Atomic Betty! He disguises himself as Galactic Guardian trainer Commander McSlim and lures Betty and her crew to the Galactic Guardian Academy for "Retraining" over the Christmas holidays, all under the watchful eyes of Maximus and a jealous Minimus. Meanwhile, on Earth, Betty dresses as Santa to spread holiday cheer to some pre-school kids.