LOS ANGELES (AP) — How often do your favorite TV outlets all carry the same show at the same time — and in prime time, without ads?

Tune in to just about any channel on Sept. 5 at 8 p.m. Eastern and Pacific to see for yourself. Dozens of broadcast and cable networks will again donate a simultaneous hour of commercial-free airtime to carry the fundraiser “Stand Up to Cancer.”

Participants will include ABC, CBS, Fox, NBC, HBO, Showtime, Lifetime, ESPNews and many others. A Canadian broadcast is being added this year.

Gwyneth Paltrow and Joel Gallen are returning to produce the telecast for a second time and other stars from TV, film and music will encourage and accept donations from the public. The money raised supports cross-disciplinary research toward new cancer treatments.