The Tonight Show Starring Jimmy Fallon Season 5 Keegan-Michael Key, Claire Foy, J.J. Watt, St. Vincent Season 5, episode 39 Keegan-Michael Key, Claire Foy, J.J. Watt, St. Vincent December 4, 2017 45 min Previous episode Queen Latifah, Freddie Highmore, Sam Smith Next episode Kate McKinnon, Patton Oswalt, Wiz Khalifa, Ty Dolla $ign