Watch: Jessica Chastain and Kate McKinnon Are Ready to Throw Down in New 'SNL' Promo

Hosting Saturday Night Live is no laughing matter. Jessica Chastain is ready to kick ass and take names in first ever SNL hosting gig... if she can remember who her nemesis is. The Oscar-nominated actress is currently making the rounds for her awards-favorite performance in Aaron Sorkin's Molly's Game and she'll be stopping by the sketch comedy series to bring her talents to late-night. Hosting SNL is a major operation and you never know how someone's going to handle the demands of live televisi...