https://www.youtube.com/watch?v=gIcaP3iLrI8

There are many subjects to bring up when speaking to Oscar winner and humanitarian George Clooney. But with no film to promote as the first guest on Stephen Colbert's debut as host of "Late Show" on Tuesday, the host had one thing on his mind.

"What is it like to be the arm candy in a relationship?" Colbert pried, referring to Clooney's marriage to international human rights attorney Amal Clooney. "Because she's the very serious person." He added, "She must say like, 'We're going to meet extremely intelligent people tonight - these are not show folk. Just be shiny and pretty."

"That's mostly what I do," Clooney quipped. "They said it wouldn't last. It's going really well."

The lovebirds will celebrate their one-year wedding anniversary on Sept. 27.

"I have nothing to push. I'm just here to see you," Clooney said, joking, "I care about me."

The A-list star spoke about his involvement with Darfur, the Sudanese region experiencing a genocide. "I thought that it wasn't getting enough play for a genocide that should get a lot of air time," he said. "I'm not responsible for making policy... My feeling was I can bring attention and make it louder."

He added that Colbert's first outing after David Letterman's exit was a huge platform for the issue. And he was right.

On Colbert’s first night at the big desk he triumphed over other late-night hosts with 6.6 million viewers tuning in, besting Jimmy Fallon’s "Tonight Show" by 3.6 million and Jimmy Kimmel’s program by 4.8 million.

"It was a very hard thing to put on the map and keep on the map," he continued.

"It's easier to come on these shows when you have something to push," Clooney said, "you want something to talk about."

The duo then aired pre-recorded segments from a faux movie that Clooney starred in, fictionally titled "Decision Strike." Colbert instructed that star to not telling him how it ends.

"I won't," Clooney said, "because the movie does not exist."

As Colbert said, "That's one [guest] down, and please come back many, many times."