It's Christmas Eve and Brock is excited for Santa to come and visit as he settles down for a bedtime story from Master Frown, Unikitty and gang burst in. They are there to stop Master Frown from ruining any more Christmases. Frown pleads innocent but Unikitty and the gang tell the stories of the past Christmases he has already ruined. Will Frown prove his innocence or will he rocket to the top of the Naughty List?