Ep. 9: Yui Discovers Medication Is Viral Mutagen as Emma Confronts Mastermind

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Yui discloses that the medication is an experimental viral mutagen intended to suppress mutant powers. Emma pursues Jun into the laboratory, where he reveals himself as Mastermind, leader of the Inner Circle. He admits to using the U-men and framing Emma for affecting Jean. After a physical confrontation, Marsh intervenes, but the X-Men arrive to rescue Emma. Mastermind attempts to control Wolverine to attack his teammates, but Cyclops snaps him out of it. Emma successfully exposes Mastermind's deception. While the X-Men confront the Inner Circle members, Xavier engages a psychic opponent in the void.