Which actor plays Guy Gardner in Lanterns?

Nathan Fillion plays Guy Gardner in Lanterns.

Gardner is an abrasive Green Lantern and a member of the Justice Gang. The series describes him as a former gym teacher, and Fillion characterized him as the Green Lantern someone would least want around during an emergency.

Fillion first appeared as Gardner in the DC Universe film Superman, released in 2025. Lanterns expands the character’s role and places him in a different environment from that film. Fillion said the series presents Gardner as somewhat more high-strung while still exploring the character’s abrasive personality.

Guy Gardner is not the same character as Hal Jordan or John Stewart. Kyle Chandler plays Jordan, while Aaron Pierre plays Stewart, the two central Lantern investigators. Fillion’s casting also provides a connection between Lanterns and the wider DC Universe, although the show was designed to stand on its own and tell a complete story.