During Marvel Televison and Netflix's "Iron Fist" panel at New York Comic Con, Oscar-nominee Sigourney Weaver was announced as the villain for the upcoming "Defenders" series.

Weaver's character was not named, as the panel wrapped moments after she arrived on stage following Jeph Loeb announcing her involvement with the series.

In a recent interview, Weaver mentioned that she has recently been watching a lot of Marvel films. “I have been watching, for whatever reason, some Marvel movies, and they cast really good actors.”

Earlier this year, Mephisto, the demon lord of Marvel's Hell, was rumored as the series' main antagonist. Though depicted as male in the comics, there is nothing about the character that would inherently prevent a gender-swapped casting, should the rumor prove true. To add more fuel to that (hell)fire, Mephisto's name was mentioned on a recent episode of "Agents of S.H.I.E.L.D." by the new Ghost Rider, Robby Reyes.

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Prior to Weaver's arrival, "Iron Fist" star Finn Jones had been joined on stage by Charlie Cox (Daredevil), Krysten Ritter (Jessica Jones) and Mike Colter (Luke Cage), marking the first time the cast of street-level heroes has ever been on stage together.

Missing from the panel, and not yet officially announced as part of the series cast was Simone Missick. Missick, who portrayed Misty Knight in the recently released "Luke Cage" series, has gone on record stating "I believe I’m safe to say that I will be on ‘The Defenders." Neither Marvel nor Netflix have commented on the potential casting.

Executive produced by Douglas Petrie, Marco Ramirez, Drew Goddard and Jeph Loeb, “Marvel’s Defenders” arrives in 2017 and unites Charlie Cox’s Daredevil, Krysten Ritter’s Jessica Jones, Mike Colter’s Luke Cage and Finn Jones’ Iron Fist.