By adding Sinestro to the cast of Lanterns, James Gunn's DCU has the opportunity to explore the complexities of one of DC's ...

Hal and John's upcoming HBO show may be set on Earth, but that doesn't mean some alien Lanterns won't be a part of their story.

Here’s how it works. Introduced in 1961’s Green Lantern #7, Sinestro was once a member of the Green Lantern Corps who trained Hal Jordan how to wield the emerald light of willpower.

The news was first reported by Deadline. In the comic books, Sinestro was a mentor of Hal Jordan, a Green Lantern, and had quite a manipulative nature to him. He was driven by power and greed ...