Pitch Black, the Nightmare king, has once threatened to attack again. In North’s warren. So, that obviously caused him to bring every Guardian—Bunny, Sandy, Tooth, and Cupid, to a meeting. And… The Man in the Moon chose Jack as a new Guardian.

“W-Why, why wouldn't he tell me that himself?” Jack groans, glaring at the moon. “After 300 years, this is his answer? To spend eternity like you guys, cooped up in some- some hideout, thinking of- of new ways to bribe kids? No, no, that's not for me!”

Jack turns to the rest of the guardians, speaking normally. “No offense.”