Rarely do broadcast networks and cable channels unite for a programming event. But, of course, these are rare times. And so we have “One World: Together at Home” (8 p.m. Saturday, various networks and other platforms; Check local listings).

Late-night stars Stephen Colbert, Jimmy Fallon and Jimmy Kimmel join forces to host this two-hour special. Organizers say it’s not a telethon, but a program intended to celebrate the heroic efforts of community health workers and support the World Health Organization and the global fight to end COVID-19.

Curated by Lady Gaga, it will feature appearances by Alanis Morissette, Andrea Bocelli, Billie Eilish, Billie Joe Armstrong, Chris Martin, David Beckham, Eddie Vedder, Elton John, John Legend, Kacey Musgraves, Keith Urban, Kerry Washington, Lizzo, Paul McCartney, Stevie Wonder and many more. Also featured: Interviews with experts from WHO, and stories of healthcare workers from around the world.

“One World: Together At Home” will also be a multi-hour digital broadcast beginning at 2 p.m. ET streaming online on multiple global platforms, including: Alibaba, Amazon Prime Video, Apple, Facebook, Hulu, Instagram, LiveXLive, Tencent, Tencent Music Entertainment Group, TIDAL, TuneIn, Twitch, Twitter, Yahoo and YouTube. The digital special will include additional artists announced today and performances from all over the globe as well as unique stories from the world’s healthcare heroes. For information about how to tune in and take action, visit www.globalcitizen.org/togetherathome.

UPDATE: Additional artists announced earlier this week are: Alicia Keys, Amy Poehler, Awkwafina, Camila Cabello, Celine Dion, Ellen DeGeneres, Jennifer Lopez, LL COOL J, Lupita Nyong’o, Matthew McConaughey, Oprah Winfrey, Pharrell Williams, Sam Smith, Shawn Mendes, Taylor Swift, Usher and Victoria Beckham.