Jessica Chastain makes her Saturday Night Live hosting debut tomorrow with musical guest Troye Sivan, and the show released a round of promos this week to get you excited. In the above clip, Chastain shows off her acting chops and attempts to teach Kenan Thompson how to play poker, and in the below promo, Chastain has a very heated altercation with Kate McKinnon before meeting her true SNL nemesis. Catch the rest when the episode airs tomorrow night – next up is returning cast member and host Will Ferrell, who is slated to host the January 27th episode.