One World: Together at Home~ Saturday, April 18, 8/7c | simulcast on ABC, NBC, ViacomCBS Networks and others The "we're all in it together" mantra defines this global all-star special, curated by Lady Gaga and hosted by the late-night triumvirate of Stephen Colbert, Jimmy Fallon and Jimmy Kimmel, saluting frontline healthcare workers around the world. Dozens of celebrities, and Sesame Street characters, will join the effort, including Oprah Winfrey, Ellen DeGeneres, Paul McCartney, Elton John and Stevie Wonder. (A six-hour streamed event on many major platforms precedes the special.)