Locals should have a keen interest in the new HBO series "Watchmen": It's set in Tulsa in the present day, but with an alternate history.

In addition, one of the show's main characters is played by Tulsa native Tim Blake Nelson ("The Ballad of Buster Scruggs," "O Brother Where Art Thou").

"Watchmen" is a dark, twisty, complex mix of drama and fantasy, masked heroes and masked police officers. Here are a few things you should know about the series.