The “Firefly” actor’s Green Lantern will first appear in James Gunn’s “Superman” this summer and then join the series.

The DC Studios show will see Fillion reprise the role of Guy Gardner, which he will play in this summer's Superman movie.

Nathan Fillion is in high demand. Following his casting as Guy Gardner in James Gunn's Superman movie, the actor is poised to ...

Nathan Fillion is proving he can do it all. After taking on the role of Guy Gardner in James Gunn's upcoming Superman ...