The Unlikely Allure of Nathan Fillion's Guy Gardner Nathan Fillion, known for his charming turns as Richard Castle and John Nolan, has made a career out of playing smart outsiders who navigate complex worlds with ease.
However, in his latest role as Guy Gardner, aka Green Lantern, he's embracing a very different kind of hero – one that's unapologetically unlikeable.
Fillion's take on the character is nuanced, and it's precisely this lack of likability that makes Gardner so compelling.