Santa, enraged, kills Ensign Jones and attacks the Enterprise in his sleigh. As Scotty works to keep the power flowing to the shields, Kirk and Bones infiltrate Santa’s headquarters. With the help of the comely and lonely Mrs. Claus, Kirk is led to the heart of the workshop, where he learns the truth: Santa is himself a pawn to a master computer, whose initial program is based on an ancient book of children’s Christmas tales. —Whatever