George Clooney: ER reunion video on Jimmy Kimmel

As one of the most popular and successful television shows of the ’90s, E.R. seems ripe for a star-studded reunion. Jimmy Kimmel attempted to do just that when he had George Clooney on his show Tuesday night. Unfortunately, Clooney was the only former cast member who showed up. As Kimmel explained to Clooney, everyone else was busy.

“This was kind of a last-minute thing, and we had some trouble getting the whole cast of E.R. to come,” Kimmel said. “[Julianna Margulies] was filming The Good Wife, so she couldn’t make it. [Noah Wyle] wanted to be here, but guess he had a thing with his family, Taco Tuesday. Eric LaSalle had jury duty.”

One person who wasn’t busy: Hugh Laurie. Dr. House himself showed up, transforming the would-be E.R. reunion into one for Tomorrowland. Laurie and Clooney both tried to shake off their TV doctor rust.

“He’s going into supraventricular tachyarrhythmia,” Clooney said.

“I don’t even remember what that is!” Laurie said.

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The sketch ends up even more insane than it sounds, with Clooney performing CPR on Kimmel to the tune of “Rapper’s Delight.”

“Remember what they taught us in TV medical school!” Laurie shouted.

Watch the full clip below.