So many stars are supporting Stand Up to Cancer.

People writes that Jessica Biel, Don Cheadle and Elizabeth Banks have signed on to star in a fundraising special set to air Aug. 19.

Keep reading to find out which other celebrities will be appearing…

Other stars who are set to appear include Julianne Moore, Ken Jeong, Maria Menounos, Danai Gurira, Tony Hale, Tig Notaro, Jimmy Smits, Eric Stonestreet and Katie Couric.

Jessica‘s husband Justin Timberlake will also make a cameo during the one-hour televised special. The show will also feature a special montage of skits from past shows with Jack Black, Bill Hader, Kevin Hart and more.

There will be a new format included this year called “How It Started, How It’s Going” which will focus on Stand Up to Cancer’s “impact and progress over the last 15 years.”

SU2C co-founder Katie Couric said in a statement: “We started this movement in 2008 to save lives and it is remarkable to see that in 15 years our scientists have accomplished this goal through breakthrough research that intercepts and treats cancer in ways we never thought possible. There is more work to do to cure cancer and every dollar counts; we will not stop until we make every cancer patient a long-term survivor.”

This year’s special will air on Saturday, Aug. 19 at 8 p.m. ET and PT / 7 p.m. CT on more than 50 participating media platforms across the U.S. and Canada.

A few weeks ago, Jessica shared a rare personal video with Justin. Check it out!