- Nathan Fillion is one of the actors who have portrayed multiple characters in the Marvel Cinematic Universe.
- Nathan Fillion was in talks to play Hank Pym in The Avengers before it was decided that Pym would not appear in the film.
- Nathan Fillion previously worked with James Gunn in Slither, James Gunn's PG Porn and Super.
- Nathan Fillion previously dated his Guardians of the Galaxy co-star Mikaela Hoover having previously worked together in Super.
- Nathan Fillion previously worked with Michael Rooker, Gregg Henry and Rob Zombie in Slither and Super.
- Nathan Fillion previously worked with Sean Gunn and Stephen Blackehart in Super and James Gunn's PG Porn.
- Nathan Fillion previously worked with Steve Agee and Nick Holmes in Super.
- Nathan Fillion previously worked with Vin Diesel in Saving Private Ryan.
- Nathan Fillion is one of the actors to portray characters for both Marvel Studios and DC Entertainment. He voiced Hal Jordan/Green Lantern in the DC Universe Animated Original Movies Green Lantern: Emerald Knights, Justice League: Doom, Justice League: The Flashpoint Paradox, Justice League: Throne of Atlantis, The Death of Superman and Reign of the Supermen.
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