Avalanche wants to join the Institute, but has trouble being accepted by the others, especially after he's accused of taking joyrides on the X-vehicles at night.

Beast is mistaken for Bigfoot by hunters while he's on a camping trip with the students.

At Xavier's urging, the Brotherhood and the X-Men unite to battle Magneto; and the Institute begins to self-destruct while students are trapped in the mansion.

A traitor in the battle threatens the efforts of the X-Men and the Brotherhood against Magneto, who has another secret weapon--the Sentinel robot.

The X-Men and the Brotherhood rally after the mansion's destruction, and they try to find Xavier and the captured X-Men.

The destroyed Institute is restored by the X-Men; Mystique escapes and sets a trap for Cyclops.

Mesmero returns and uses Gambit's powers to free Apocalypse.

Mesmero tries to free Apocalypse once again and uses Rogue to help him, while the X-Men join forces with Magneto and the Acolytes to stop him.

Mesmero releases Apocalypse from his tomb and the X-Men, Brotherhood and Acolytes rush to the tomb to fight him.