Ben 10 season 3 episode 4 : Merry Christmas

Ben, Grandpa Max, and Gwen come upon a bizarre Christmas village run by a Christmas-obsessed man who thinks Grandpa Max is Santa Claus and proceeds to trap him. As Ben and Gwen explore, they learn about a strange curse on the village from one of its few unloyal elves, who happens to be the son of the Christmas-obsessed man. The village was frozen at Christmas, in the 1930s, But when Ben delivers all the gifts that had been made, time catches up to the village instantly.