Stephen Colbert announced "The Late Show" was cancelled three nights after revealing his summer mustache on air. Coincidence?

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

Late-night rivals and other celebrities rallied to support CBS "Late Show" host Stephen Colbert after the network canceled his show, and comedian Jon Stewart lashed out at Paramount Global for the decision to end the long-running TV program.

Sandra Oh criticized CBS and Paramount during her appearance on 'The Late Show with Stephen Colbert' on July 21 after its cancellation was announced. The network said it was "a financial decision," but the news came days after Colbert criticized Paramount for its $16 million settlement with President Donald Trump.

The FCC chairman called out at the "partisan left's" reaction to Stephen Colbert's cancellation by CBS on Monday, saying they were acting like they were losing a "loyal" spokesperson.

Colbert began the episode criticizing Paramount for its decision. “How can it be a purely financial decision if The Late Show is No. 1 in ratings?” he asked. “A lot of people are asking that question.

Fox News host Greg Gutfeld is the ratings king of late night with 3.1 million average viewers, despite what Stephen Colbert may be telling his audience.