Chickens. For centuries we have oppressed them, grilling, roasting, stewing, and stuffing them in buns. The time has come for us to pay. Intergalactic chickens (with Santa hats!) are trying to spoil Christmas! It's time for you to fight through 120 waves of these festive chicken invaders for our ancestral right to omelettes. Will you succeed? Will chicken become the new holiday meat of choice? Or will you end up as a shiny ornament on their Christmas tree?