The official synopsis of "DC's Legends of Tomorrow" states that the team will face an "immortal threat unlike anything they have ever known," which plenty of DC Comics fans interpreted as a reference to Vandal Savage, an immortal villain first introduced by Alfred Bester and Martin Nodell in 1944's "Green Lantern" #10. At The CW's upfront presentation Thursday in New York City, the network reportedly made it clear that Vandal Savage is indeed the show's primary antagonist in its first season.

According to sources including tweets from Entertainment Weekly and IGN reporters, Vandal Savage was confirmed as the show's first major villain via preview footage shown during The CW's presentation, which will likely make its way online later today.

Vandal Savage is traditionally depicted as a former caveman who has spread his villainy through every era of history, recently seen in DC's 2013 "Trinity War" story. He's been depicted multiple times in animated productions, and in "Smallville" season seven, Dean Cain played a character very similar to Vandal Savage, though not named as such.

Here's the "Legends of Tomorrow" official synopsis:

When heroes alone are not enough... the world needs legends. Having seen the future, one he will desperately try to prevent from happening, time-traveling rogue Rip Hunter is tasked with assembling a disparate group of both heroes and villains to confront an unstoppable threat - one in which not only is the planet at stake, but all of time itself. Can this ragtag team defeat an immortal threat unlike anything they have ever known? DC'S LEGENDS OF TOMORROW stars Victor Garber ("The Flash," "Alias"); Brandon Routh ("Arrow," "Superman Returns"); Arthur Darvill ("Doctor Who"); Caity Lotz ("Arrow"); Ciarra Renee ("Pippin"); Franz Drameh ("Edge of Tomorrow"); with Dominic Purcell ("The Flash," "Prison Break"); and Wentworth Miller ("The Flash," "Prison Break"). Based on the characters from DC Comics, DC'S LEGENDS OF TOMORROW is from Bonanza Productions Inc. in association with Berlanti Productions and Warner Bros. Television, with executive producers Greg Berlanti ("Arrow," "The Flash," upcoming "Pan"), Marc Guggenheim ("Arrow," "Eli Stone," "Percy Jackson: Sea of Monsters"), Andrew Kreisberg ("Arrow," "The Flash," "Eli Stone," "Warehouse 13") and Sarah Schechter ("Arrow," "The Flash," upcoming "Pan").