“X-Men: Apocalypse” is still one year away, but rumors of which superheroes will appear in the upcoming action flick have gotten fans of the Marvel series buzzing. Director Bryan Singer recently confirmed that albino mutant tracker Caliban will be featured in the film.

Singer posted a photo of the “Apocalypse” film set on Tuesday to Instagram, along with the caption, “Shooting Caliban’s place of ‘business.’” Singer was pictured in an underground lair that appears dark and somewhat ominous. This will be the first time Caliban, a mutant with the ability to locate other mutants, will appear in the “X-Men” film franchise.

Caliban was named by Callisto after the creature in William Shakespeare’s “The Tempest.” He resides in the sewers and empty subway tunnels beneath Manhattan, shelters that were originally built during the 1950s by the U.S. government in case of an emergencey, but were later forgotten. The character has appeared in “X-Men: The Animated Series.”

Caliban first appeared in the Marvel comic books in 1981. Using his uncanny ability, he locates and organizes a group of mutants called the Morlocks, a large community of physically deformed mutants that also lives in the New York City sewers. The Morlocks obtained their name from the subterranean creatures in author H.G. Wells’ book “The Time Machine.” Does this mean the Morlocks will also appear in “X-Men: Apocalypse?” Nothing’s been confirmed, but it does seem likely.

Neither Fox nor Marvel Entertainment has hinted at which actor will play Caliban or how major of a role he will play in the forthcoming installment.

“X-Men: Apocalypse” will reach theaters on May 27, 2016. Jennifer Lawrence, James McAvoy, Michael Fassbender, Nicholas Hoult and Rose Byrne will reprise their roles in the film.