Another batch of Sidri hatchlings secretly takes over the now abandoned X-Mansion, where they surprise and capture Lady Mastermind when she comes looking for a portal to the X-Men's new domicile on . However, when a team of X-Men is sent to investigate the presence of a mutant in the mansion, one of its members - Cypher - manages to establish a rapport with the Sidri, enabling the X-Men to free Lady Mastermind peacefully and permitting the Sidri to guard the portal.