Sylvester Stallone and Dolph Lundgren are a macho-man pairing for the ages.

Appearing on “The Tonight Show” on Thursday, Stallone told Fallon about the first time he met Lundgren.

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“In ‘Rocky IV’ I really wanted a big, horrible, vicious guy,” he said. “Like a primitive. And I couldn’t find him. I’m finding giant wrestlers and football players and that. And then all of a sudden the door opened, the smoke came in, there’s light.

“[He had a] proceeding hairline, shoulders this wide, everything was perfect. Even his calves were coming through his clothing. Just muscular. Blue eyes are staring into my soul. He was the real Terminator, and I was like, ‘I hate this guy. He’s too perfect. And if I loathe him, I’m sure the world will.’ He’s not really, but he looks like something from a thousand years into the future.”

The 73-year-old also teased that he and Lundgren are actually in the early stages of work on a new TV project.

“There’s an idea we’ve come up with called ‘The International’,” Stallone explained. “It deals with the UN but it’s a different kind of UN, a little hardcore. There’s a lot of action in it but it also really feeds into who Dolph is, because he is international. He’s incredibly intelligent so he’s going to bring a different spin to the whole thing.”

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Stallone also responded to the revelation from actor Henry Winkler that he based his performance as the Fonz from “Happy Days” on Rocky Balboa.