Cosmic Xmas is the last stage in Christmas in Space.
Dark Emperor Santa appears at the start of the battle.
After 16.7 seconds, Hyppoh and Heavenly Hippoe start spawning in tandem.
After 50 seconds, Satan Claus is sent out. Soon after, Imperator Sael and Scissoroo start spawning periodically.
After 83 seconds, another Satan Claus spawns.
Lineup: 3-4 meatshields (Catellite is recommended) Crazed Dragon, King Dragon, a mid-ranger (e.g. Seafarer, Pizza, Cyborg, etc.), Ururun, Li'l Nyandam
Bring Cyberpunk, and Ubers that have 500+ range, immune to freeze cats are also very good. Aphrodite is a very very very solid Uber for this. Aer can also help.
Battle: Just spam meatshields, and wait until your Ururun and Nyandam finish off the red Nyandam. when the red one dies, dragon cats should kill the alien nyandam.