Nathan Fillion joins 'Superman: Legacy' cast as Green Lantern alongside Hawkgirl, Mister Terrific, and Metamorpho

James Gunn's Superman: Legacy will feature several DC superheroes besides just Superman.
Nathan Fillion will play Green Lantern Guy Gardner, Isabela Merced is Hawkgirl, Edi Gathegi is Mister Terrific, and Anthony Carrigan is Metamorpho.
The film will focus on Superman and Lois Lane's early days at the Daily Planet with other heroes already established.
Gunn aims to reboot the DC universe with a new direction and lineup compared to previous attempts.
The cast indicates this will not be an origin story and Superman arrives into an existing world of superheroes.