Notably, Mister Sinister was teased during the post credit scene of "Apocalypse" as a man was shown putting a vial of "Weapon X" into a suitcase labeled Essex Corp., a reference to Mister Sinister's real name of Nathaniel Essex.
Kinberg and Singer revealed no other information regarding the character or how he would fit into the still mysterious "Wolverine 3" which has yet to receive an official title.
"Wolverine 3" is said to be Jackman's last turn as the iconic clawed mutant after sticking with the character since 2000's "X-Men."
Patrick Stewart confirmed that he would be returning to his role as X-Men head Charles Xavier in the film.
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