Nathan Fillion is set to become a pivotal part of the new DCU after Superman, but the actor also has a long history with the MCU, including a cameo in last year's box office hit Deadpool and Wolverine.
"Ryan [Reynolds] would text me and say, 'Hey, would you do me a favor?' Like I'm doing him a favor," he said in an interview with Entertainment Weekly. "We recorded a bunch of different stuff. We started at one character, then we moved over to being Headpool, and then we were futzing the jokes."
