The Christmas Aliens is a season 3 episode of the 2003-2009 animated Teenage Mutant Ninja Turtles series. It originally aired over Foxbox on 25 December 2004.
It's Christmas on the Ninja Turtles' Earth, and Michelangelo fights the Purple Dragons, who try to steal toys from an orphanage. When the Ninja Turtles have a Christmas party in their sewer hideout, Miyamoto Usagi is one of the guests invited.
This shares the same name and general story with the Michelangelo one-issue micro series printed in Dec. 1985, though the comic doesn't feature Usagi and Gen visiting for dinner.