Trying to beat the summer heat, Dr. Brown takes all out to London on Christmas Eve 1845, where they encounter citizens who may have inspired Charles Dickens characters in A Christmas Carol, Oliver Twist, David Copperfield, and others.
It's Christmas, so Queen Slug-for-a-Butt decides to kidnap Santa Claus and brainwash him to be evil and join her in her attempt to take over the world.
Based on E.T.A. Hoffman's classic story, "The Nutcracker and the Mouseking" is the tale of a spoiled prince who lives in a magnificent palace with his magician uncle, Drosselmeier.