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.

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.

Scott and Rogue end up on a geology club field trip together. Scott tries to be friendly to her, but it turns out Mystique has other plans...

Magneto reveals the his plans for the winners of his challenge - to fully unlock their powers with a machine he has built. Back at the mansion, those left behind regroup, and decide to pay Magneto a little visit.

Magneto steals plans for a top-secret project that produced super soldiers. Wolverine worked on it during World War II.

Mystique frees a mutant called the Scarlet Witch from an asylum, hoping she'll help the Brotherhood, but Mystique doesn't know the witch is seeking revenge on Quicksilver and Magneto.

Rogue's nightmares seem to show images from Kurt's past, but in them he's far too young to remember. So where did they come from?

As mysterious metal pods appear, picking up the mutants one at a time, Cerebro detects a new mutant in Hawaii: Alex Summers - Scott's believed to be deceased brother.

After being kept in the dark about her powers for years, a young female mutant touches a fellow student and absorbs his strength, his memories - his life. Afraid and confused, and unable to differentiate her memories from the absorbed ones she runs away - straight in to the hands of Mystique.

Jean's telepathy changes, arriving in surges she can't control; and Hank McCoy joins the faculty as a science-and-gym teacher.

Xavier suspects that a flying "angel" seen above New York is a mutant, and he sends Cyclops and Rogue to find him before Magneto does.

While the X-Men are at a summer camp, learning survival training, Mystique releases Cain Marko - the unstoppable Juggernaut - in hopes of getting his help in obtaining Xavier's mutant location system.

Jean is possessed by a mutant with telepathic powers, which he uses to control the students and have them help him in his plot to release the imprisoned Apocalypse, a mutant who wishes to enslave the human race.

A news report from the Canadian mountains triggers something deep inside Wolverine, and he starts having berserk fits. To find out why, he takes the Blackbird to the site, not knowing that Kitty and Kurt are sitting in the back.

Forge invents a teleporter, and Nightcrawler uses it to travel large distances, but inadvertently opens a portal that allows strange creatures to follow him back to the school.

When Cyclops and Nightcrawler save people from a car crash they question Xavier's desire to keep their identities a secret. Meanwhile, the Brotherhood terrorize people in a crowded stadium.

The serum Hank McCoy uses to control his mutation no longer works, and his students are afraid of his angry outbursts.

Mystique sees an opportunity to get a spy in Xavier's institute when the morally shady Todd Tolanski starts exhibiting mutant powers. Kurt Wagner, Xavier's latest recruit, arrives and tries to familiarize himself with his new life as part of the X-Men.

15-year-old Kitty Pryde wakes up one day and finds herself able to walk though objects. She tries to ignore it, but finds that hard when she's approached by Jean Grey and a mutant trouble maker, who both say they know what she's going through and want to help her. Meanwhile Wolverine's old nemesis, Sabertooth, arrives in town - looking for trouble.

The young X-Men are left alone in the mansion when the adults respond to a jailbreak, and they throw a party that doesn't end well.

The only thing bigger than Fred Dukes' strength and size, is his temper, which makes his first day at school rather difficult. When Jean Grey makes contact, trying to be friendly, he takes it just a bit to seriously.

Kurt accidently finds an abandoned lab, and is sucked into a pocket dimension by a strange device he finds there.

Nightcrawler has a crush on a new student. The wild girl is grounded for breaking the rules, but things get worse when her father arrives and asks that she help him in a bank robbery.

Ororo's nephew starts exhibiting mutant powers, but he's more interested in settling a rivalry with a fellow mutant than hearing about a ""school for freaks"".

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.