Jack Frost

The Guardians—Santa Claus, the Tooth Fairy, the Easter Bunny, Sandman, and Jack Frost—were sitting in the main hall discussing Christmas to figure out how to help North (that's Santa). But suddenly, the Man in the Moon (Moon) began choosing a new guardian, though an unusual one: a Guardian of Halloween. From beneath the floor, right next to the large telescope by the window, moonlight began to stream in, hitting a moonstone. The silhouette of a girl and her location appeared on the stone. Santa Claus then asked Jack to go and fetch the new Guardian. Jack complained for five minutes, but eventually set off to find the Guardian of Halloween.