Intro summary: A Wise Old Owl conjures up a Magic Mirror for Greg and his friends Pat and Emily, who use it as a portal to jump back in time, in order to change situations where they have misbehaved. In this way, they learn meaningful lessons and morals, and Greg becomes a "good" boy.
-- In this episode, Jack, Pat and Emily look forward to eating a chocolate cake on Christmas Eve. But instead, they find there is only a humble pie. They refuse to eat it. Greg's mother serves little Christmas carollers, who eat it gratefully. The wise Owl makes Greg and his friends go back in time via the Magic Mirror, to undo their previous actions. They come out having learnt the lesson of appreciating and eating all kinds of food.
Lyrics: Little Jack Horner
"Little Jack Horner
Sat in the corner,
Eating a Christmas pie
He put in his thumb,
And pulled out a plum,
And said, ""What a good boy am I