As the release date for HBO's upcoming Watchmen series draws near, fans can expect to see more and more of the show's numerous superheroes teased. The most recently released promotional poster features Regina King, who was only recently revealed to be playing a superhero by the name of Sister Night.

The poster has King in full costume, which includes what looks to be a sheriff's badge, a string of beads and face paint. Behind her is a large, yellow clock -- one of the more recognizable symbols of the Watchmen franchise. Across the bottom of the poster reads an ominous declaration: "It's time."

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Watchmen-Key-Art-Sister-Night

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The upcoming series will serve as a sequel of sorts to Alan Moore and Dave Gibbons' revolutionary graphic novel of the same name, which blended realism with the superhero concept in ways that comic books had almost never done before, paving the way for substantially darker, grittier superhero stories.

HBO's Watchmen will take place long after the events of the graphic novel, in an alternate 2019 in which Robert Redford is president and has been since 1992. A few familiar characters will appear in the series, including Ozymandias, Silk Spectre, Dr. Manhattan and more. At this time, the extent of their roles is largely unknown.

Developed by Damon Lindelof, HBO's Watchmen stars Jeremy Irons, Regina King, Don Johnson, Tim Blake Nelson, Louis Gossett Jr., Yahya Abdul-Mateen II, Tom Mison, James Wolk, Adelaide Clemens, Andrew Howard, Frances Fisher, Jacob Ming-Trent, Sara Vickers, Dylan Schombing, Lily Rose Smith and Adelynn Spoon. The series will premiere Oct. 20.