It's almost hard to keep track of how much mayhem is coming to The CW's five-part crossover Crisis on Infinite Earths, but a new extended look does its darndest to sum up just how effed our heroes appear to be. Starting Sunday, December 8, Crisis will encompass Supergirl, Arrow, The Flash, Legends of Tomorrow, and Batwoman while also dragging in familiar faces from Black Lightning, Smallville, and Batman: The Animated Series. (Well, Kevin Conroy is here, at least.) [caption id="attachment_855069" align="alignright" width="360"] Image via Dean Buscher/The CW[/caption] The new trailer does feature …