The team is searching for their mentor but instead they find a bunch of Prime Sentinels masquerading as X-Men, who, in turn, are holding Mimic prisoner. After a fight, the Excaliburs decide to let the Prime Sentinels escape destruction, and the Sentinels seem grateful.
Mimic is overloaded and they are able to take him back with them for treatment.
In the background, Meggan and Captain Britain are getting ready to get married.
And nobody finds Charles.