In this thrilling sci-fi action movie Christmas special spectacular, the machines rise up, destroying mankind. But children weren't stupid enough to fall for the terminators, and they hid from them, effectively insuring a future for mankind. But the machines want to completely eradicate mankind, making us extinct, and to do so, they've got to get those wily children.
And so, to lure the children into their trap, at Christmas the machines send a terminator Santa Claus to the remnants of malls throughout the world, inviting children to come sit on Santa's lap and tell him their Christmas wishes. And when they show up to sit on Santa's lap, it's curtains! But, once the plan is put into practice, the magic of Christmas warms the terminator Santa Claus hearts, and they allow the children to live, only for the kids to upload some nasty viruses into the machines, destroying them, and saving humanity for good.
(In non-Christian countries, the special ends differently, with the terminators killing all the children, and it's used as a propaganda lesson on why it's good not to be a Christian.)