John Oliver, Jon Stewart, Jimmy Fallon, Seth Meyers and more had cameos during the July 21 episode of "The Late Show With Stephen Colbert."

David Letterman showed support for Stephen Colbert by posting a YouTube compilation of clips of him slamming CBS on "The Late Show."

Monday night's (July 21) show also featured kiss cam-style pop-ins from supportive fellow talkers Anderson Cooper, Jimmy Fallon, Jon Stewart and Adam Sandler.

Stephen Colbert got an assist on 'The Late Show' from some of his late-night rivals following CBS's sudden decision to axe the show.

After CBS said it was canceling "The Late Show," people online claimed its host announced a new show in collaboration with MSNBC host Rachel Maddow.

The first politician to weigh in happened to be the show’s July 17 guest, Sen. Adam B. Schiff, D-Calif. He posted on social media, “Just finished taping with Stephen Colbert … If Paramount and CBS ended the Late Show for political reasons, the public deserves to know. And deserves better.”

The state of late-night TV is keeping media executives from sleeping well. CBS’ decision to cut ties with Stephen Colbert and its decades-old “Late Show” franchise come next May will leave a major hole in the format — but one that has been widening.