He was expected to appear in the series, but now we have official word: Nathan Fillion will appear in the upcoming "Lanterns" series on HBO. The star of "The Rookie" will play Guy Gardner, a member of the Green Lantern Corp whose live-action role Fillion will debut this July in "Superman.

To those asking what True Detective has to do with a Green Lantern show, we have an answer. The show centers on a rookie Lantern, John Stewart (Aaron Piere), and a veteran, Hal Jordan (Kyle Chandler), investigating a murder in the American heartland. If you think about it, rings are a flat circle, too.

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