Guest announcer Kelsey Grammer; skits, stunts, giveaways, hidden-camera pranks and more; Backstreet Boys perform; Olympic gold medalist Apolo Ohno.

Guest announcer Kelly Ripa; skits, stunts, giveaways, hidden-camera pranks, and more with singer Ray Parker Jr. and journalist Meredith Vieira.

Guest announcer Reba; skits, stunts, giveaways, hidden-camera pranks, and more with singer OMI, and actors Jesse Tyler Ferguson and Jane Krakowski.

Guest announcer Jack Black; skits, stunts, giveaways, hidden-camera pranks, and more with Olympic gold medalist Apolo Ohno, and journalists Matt Lauer and Savannah Guthrie.

Celebrities participate in stunts, skits, giveaways, and more; guest announcer Shaquille O'Neal.

Celebrities participate in stunts, comedic skits, performances, mini game shows, giveaways, pranks and more; guest announcer Tyler Perry.

Celebrities participate in stunts, comedic skits, performances, mini game shows, giveaways, pranks and more; guest announcer Alec Baldwin.

Reese Witherspoon serves as the celebrity guest announcer during the series premiere of this variety show hosted by Neil Patrick Harris, which features A-list stars, performances, stunts, comedy skits, mini game shows, audience giveaways and hidden camera pranks. Based on the British series "Ant & Dec's Saturday Night Takeaway."