Riot features a group of regular players - including John Ross Bowie, Jamie Denbo, Brian Palermo, Jordan Black, Jessica McKenna, Meryl Hathaway and Rob Gleeson - improvising a series of showdowns designed to test mind and body. Throughout the show, the players must think on their feet as they face unpredictable song, dance and sketch challenges, often while navigating the show's trademark one-of-a-kind set, tilted at a 22 degree angle. Each week, special celebrity guest stars also will be featured. Confirmed guest stars include Carell, Jason Alexander ("Seinfeld"), D.L. Hughley ("The Original Kings of Comedy"), Cheryl Hines ("Suburgatory"), Tom Green ("Tom Green Live"), Chris Kattan ("Saturday Night Live"), Mayim Bialik ("The Big Bang Theory"), David Arquette ("Pushing Daisies,"...