The Upright Citizens Brigade: Matt Besser, Amy Poehler, Ian Roberts, and Matt Walsh, alongside special guests, perform their signature comedic improvised long-form, ASSSSCAT, to kick off the 20th anniversary of UCB's annual Del Close Improv Marathon. From a single audience suggestion, the Upright Citizens Brigade and guests conceive and execute a fully improvised theatrical experience. ASSSSCAT is the world's longest running improvised show, having been performed every week for the past 22 years at the UCB's New York and Los Angeles theatres.