Jennifer Aniston, Scarlett Johansson and Charlize Theron are among the A-listers who signed on for the Stand Up To Cancer telethon in September.

American Idol David Cook, Christina Applegate, Meryl Streep and Sally Field also will appear on the Sept. 5 broadcast, which will be simultaneously aired on ABC, CBS and NBC to raise money for cancer research and treatment.

Dozens of other celebrities and sports figures will also be appearing on the program, according to Stand Up To Cancer.

More info on the broadcast:
On Friday evening, September 5, 2008, the networks will donate one hour of primetime for a history-making interactive television special, uniting the nation as we Stand Up To Cancer, including:

Performances by legendary recording artists.

Over 50 of the biggest names in TV, film, sports and music will participate in the live phone bank, answering calls from viewers who want to donate.

Segments on cutting-edge research -- likely to be reported by network news anchors Katie Couric, Charles Gibson, and Brian Williams -- will include intimate dialogue with the renowned scientists who are making the big, potentially life-saving discoveries.

Celebrity performances and participation in special live and filmed pieces designed to educate, inspire and entertain.

+ Tune in September 5th, 2008 at 8:00 pm, ABC, CBS, NBC