The critically-acclaimed sketch comedy group Upright Citizens Brigade is bringing its signature improvised sketch comedy show, "ASSSSCAT: Improv," to Bravo this fall. The fully improvised one-hour special stars the Upright Citizens Brigade: Matt Besser, Amy Poehler, Ian Roberts and Matt Walsh.

Special guest performers include Saturday Night Live's Rachel Dratch, Tina Fey, Horatio Sanz and Late Night with Conan O'Brien's Kevin Dorff and Andy Richter.