"Deadpool" took over TBS' late night show "Conan" in a big way last night, with leading man/merc Ryan Reynolds dropping by to premiere the movie's trailer. In addition to revealing the first official "Deadpool" footage, Reynolds also chatted with Conan O'Brien about the fan-favorite character.

WATCH: First "Deadpool" Trailer, Plus R-Rated Version

"He's a Canadian mercenary who's stricken with cancer who goes into the same program that made Wolverine," said Reynolds. At this point, though, O'Brien interrupted his guest to reveal that he actually knew a lot about Deadpool -- because 'Pool once saved his life. In the sketch below, you'll get to see just how Wade Wilson first met O'Brien -- and it also points out something you may have never noticed about the late night mainstay's physique.

"Deadpool" opens on February 12, 2016.