Viola Davis, Kristen Wiig, Jon Hamm and More Added to Star-Studded "Stand Up to Cancer" Lineup

Stand Up to Cancer is a charitable organization that raises funds to accelerate the pace of cancer research and treatment.

The hourlong, commercial-free special will air Friday, Sept. 9 at 8/7c on ABC, CBS, FOX and NBC, along with several cable networks including Bravo, Comedy Central, E!, Fusion, FXM, HBO, LMN, Logo, MLB Network, National Geographic, Pivot, Showtime, STARZ, TBS, VH1 and WGN America.