Instead of having grownups write a Christmas movie for kids, Stephen Colbert gathered a group of children to write their own Christmas movie concept. That part of the segment was funny enough but then he got some of his celebrity pals to star in the faux film’s trailer — Bryan Cranston, Laura Linney, Nick Kroll, Rachel Dratch, and John Oliver — and that put it over the top. Watch the hilarious trailer for Santa Fight: Saving the Holiday from Atnas.