The coolest crime fighters around these days, the Powerpuff Girls, have a Christmas special tonight, 'Twas the Fight Before Christmas, on the Cartoon Network. Zap2it details the plot in a Clement Moore style poem:

The villain in this cartoon is a brat named Princess Morbucks
Whose sole unmet wish is to be a Powerpuff Girl -- shucks
Spoiled to her marrow, she travels to the North Pole
With thoughts of computer hacking poisoning her soul.
She discovers the list of nice and naughty
And as a rotten kid who defines haughty
She switches the list of the good with the bad
Figuring no one will know they've been had.

And, of course, Blossom, Buttercup and Bubble must save the day.

Other top Christmas time cartoons: A Charlie Brown Christmas (but sad!), animated The Grinch Who Stole Christmas, and any Rankin/Bass production – Rudolph the Red Nosed Reindeer, Frosty the Snowman.