“The Late Show with Stephen Colbert” came to a climactic and possibly interdimensional end on Thursday night as the show’s final guest led a rousing sing-along to an almost too-fitting song.

Throughout the show, bizarre “technical difficulties” kept occurring, much to Colbert’s chagrin. When the late-night host finally had enough, he meandered backstage to find the culprit: an interdimensional portal destined to swallow him at the conclusion of the show.

Some special guests showed up to try and explain the portal, including “Daily Show” host Jon Stewart, astrophysicist Neil DeGrasse Tyson and fellow late-night hosts John Oliver, Seth Meyers, Jimmy Kimmel and Jimmy Fallon.

“You can’t ignore it. The only choice you have now is how you choose to walk through it. You can go kicking and screaming,” Stewart said.

“That one,” Colbert said.

“Or you can do what you’ve done for the past 30 years when faced with something dark. You stare it down, and you can laugh,” Stewart said.

As Colbert returned to the stage, the portal suddenly appeared on the ceiling of the Ed Sullivan Theater and sucked him and his studio audience into what we can only presume is late-night purgatory.

Colbert concluded the show by joining some music legends for the program’s two final performances, one alongside Elvis Costello singing “Jump Up” with current and former “Late Night” bandleaders Louis Cato and Jon Batiste, and the other featuring Paul McCartney singing “The Beatles” song “Hello, Goodbye.” The latter performance saw Colbert’s wife, producer Evelyn McGee-Colbert, and the show’s staff join Costello and Cato and the Great Big Joy Machine in singing the aptly titled song.

The final shot of the program revealed the portal appearing in the sky above the Ed Sullivan Theater, sucking it up and spitting out a snow globe with the building inside, quietly playing the “Late Show” theme music.

Check out the final musical performances here.

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