Not-so-Silent Night is the third stage of Christmas in Space.
The stage starts off with a Pigge. Followed by Queen Elizabeth LVI. The Pigges will continue spawning on a regular basis. Upon base hit, Satan Claus and another Queen Elizabeth LVI will spawn. Treasures from Into the Future are recommended because of the aliens. You should have most if not all treasures before attempting this stage as they are incredibly helpful.
Start off with 2 or 3 meatshields, then start stacking Castaway Cat/Seafarer Cats and an anti-Alien Uber with good range (i.e. Radiant Aphrodite, Bazibon, Catman etc.) and a cat that can block the warps caused by Satan Claus such as Catellite.