In just a few days, the highly-anticipated Arrowverse crossover event, "Elseworlds," will finally air on The CW over three nights. The crossover is perhaps the biggest and most ambitious yet, with such characters as Batwoman, Superman, Lois Lane and The Monitor all appearing alongside The Flash, Green Arrow and Supergirl for an epic comic book event on the television screen.

Already, we have seen that "Elseworlds" will not only feature the appearance of some of the DC Universe's biggest characters, it will also bring back some fan-favorite elements from DC's past. It's already been confirmed that fans of the Superman origin series Smallville are in for a treat (outside of the glimpse of Justin Hartley's Green Arrow costume in this week's Supergirl after-credits scene), and we also know that John Wesley Shipp will reprise his role as Barry Allen from the 1990 television series,  The Flash.

What's more, we now know that the crossover will also feature a nod to Christopher Nolan's Batman film, The Dark Knight Rises.

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Elseworlds Nora Fries Bane mask

A new picture from "Elseworlds" has been released online, featuring actress Cassandra Jean Amell as Nora Fries. And, on a shelf next to Nora, fans can immediately recognize the mask that was worn by Tom Hardy's Bane in The Dark Knight Rises.

A previous picture of Nora (which appears to be lifted from the same scene) saw her staring at Mr. Freeze's gun, which leads us to believe that the character may be staring at a collection of artifacts belonging to the Caped Crusader's rogues gallery.

Of course, this is more than likely a simple nod to Nolan's popular Batman trilogy, but it could hold wider significance. Does this mean that The Dark Knight trilogy has retroactively been added to the Arrowverse? Or is it simply that a version of Bane, one very similar to Nolan's, is one that exists on Earth-1? Or, given that the events of the 1990 series The Flash were confirmed to take place on Earth-90, perhaps Nolan's entire trilogy takes place on an Earth of its own -- one that constitutes the Arrow multiverse.

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This year's Arrowverse crossover event will involve the casts of Supergirl, Arrowand The Flash. The event will unfold over three nights, starting with a special episode of The Flash on Sunday Dec. 9, at 8 p.m. ET/PT. Then, it continues Monday, Dec. 10, with Arrow, and concludes on Tuesday, Dec. 11, with Supergirl.

(via io9)