On a cliff above the ocean in the ruins of McFadden Castle, Scotland, at
night, a party is taking place. A man named Lucas is walking past the
partying teens, and they all seem to admire him. He walks into an
underground part of the castle, a dungeon, opening and closing doors
telekinetically. He lifts a grate the same way and floats into a chamber. He
talks to an unseen boy called David, telling him that if he really wants to
end it, there's only one way – to call him.

In Xavier's bedroom, the phone rings, waking him up. He picks up the phone,
and on the other side of the line a voice says "please, I need your help,
father", to his shock.

Later, on the Blackbird, Storm, Professor X, Cyclops and Jean are flying to
Scotland. Xavier is on the phone with his ex-wife, Gabrielle Haller. He
tells her that even with Cerebro, he doesn't just scan the world with his
telepathic powers unless he's looking for someone and he would never think
to look for a son he wasn't aware of. In the back, Jean and Scott are
talking about how weird it is that the professor has an ex-wife they didn't
even know about. Ororo interrupts them and suggests that they'll check in
the mansion to see how Kitty is doing.

By the front doors of the mansion, Beast is standing with a bunch of
backpacks, calling for the New Mutants, as they have to go to school.
Jamie(s) run down the stairs, followed by Bobby on ice and Roberto. They
take their backpacks and leave to school. Next are Amara and Ray, though
Amara hasn't had time to dry her hair. Ray holds the plug of her hair drier
and it starts, and they leave too. Last is Sam, flying past Hank and taking
his backpack on the way. Just as he leaves, the videophone rings. It's Scott
and Jean, calling to check if Kitty's flu is any better like Ororo
suggested. Hank answers that not only she's still ill, now Kurt is sick too.

In Kurt's room, Kurt is sleeping. Hank opens the door to check on him, and
leaves after seeing he's asleep. Kurt sneezes and teleports to the hallway,
still sleeping. He then sneezes again, appearing in an empty bedroom.
Another sneeze sends him back to his bed.

In Kitty's room, she's also sneezing on her bed, though awake. She looks
pretty sick. Hank enters to check on her and suggests that she tries
sleeping, and she says that every time she closes her eyes, she has this
nightmare that she's at school in her pajamas.

In the Blackbird, Xavier sighs and decides to finally tell the curios Scott
and Jean that he was married briefly to a woman named Gabrielle Haller many
years ago, and they had a son he knew nothing of until that day, and now
he's been kidnapped. In the McFadden Castle dungeon, David is seen. He's
dirty and his clothes are torn.

At Gabrielle's house, the mutants arrive. Gabrielle starts thanking Charles,
but he seems to be angry that she didn't tell him about David and stops her
in the middle, cutting to the chase. He asks her if she heard from the
police and she says she hasn't. Storm then introduces herself, Cyclops and
Jean to Gabrielle and assures her that they'll find her son. Xavier gets to
the issue again, telling his ex-wife that they'll need a complete list of
David's friends and the places he goes regularly. She answers that they just
moved there and David didn't have any friends, before she starts crying.

At McFadden Castle, David manages to just from a pile of rocks to the grate
and open it, freeing himself. He starts running through the halls with no
idea on where he's going, and arrives at the stairs leading to the party. He
tries to escape to the door without getting caught, but some of the punks
notice him and walk after him. He runs for a while, but then reaches a dead
end.

At Gabrielle's house, Gabrielle and Xavier are arguing about Gabrielle
hiding David from Xavier all these years. She tells him that it wasn't to
hurt him – she just didn't want David growing up with a father who didn't
have time for him. He tells her that she's just blaming everything on his
study of mutants and asks if that's what she told him. She answers that
David knows nothing about him – or at least she thought so.

Outside the house, Lucas is hiding. He sees Jean through the window of
David's room. In the room, Jean and Scott are going through David's stuff.
Suddenly, Jean spots a boy in the hallway. He runs away, and she follows,
though he disappears. Gabrielle enters and explains that that's Ian - David
found him living on the street and he's been with them ever since. Scott
asks if he said anything about Ian, and Gabrielle answers that Ian doesn't
talk. Jean thinks maybe a telepath can get an answer out of him and runs out
of the house to look for him. Outside, she sees a shadow hiding and,
thinking him to be Ian, runs after him. Suddenly, a ring of fire surrounds
her. Lucas shows up and knocks her out mentally.

At the Institute, Kitty is still ill and sneezing, when she runs out of
tissues. Annoyed, she gets out of bed and walks to Kurt's room, where he
just sneezed and teleported again under his bed in his sleep. She enters and
finds Kurt sleeping under the bed, so she grabs his tail and tries pulling
him away, just as he sneezes again, teleporting them both to the front steps
of Bayville High. Kitty is terrified that her nightmare is coming true, and
tries to wake up Kurt before anybody sees them, just as they teleport again
on the teacher's desk of a classroom, to everybody's laughter. Angry, she
drags Kurt down the hall, as he sneezes again and they teleport to the
street. A car drives by, spraying Kitty with water.

At McFadden Castle, Jean wakes up with her ankles and wrists tied up. She
tries to release herself, when suddenly the wrist lock unlocks on its own –
with Lucas's telekinesis. She asks him who he is, and he answers, after
releasing her ankles too, that he's a mutant like her, but his friends call
him Lucas. She walks away, but he stops her. She telekinetically tosses him
on a wall, but, like before, he knocks her out mentally. He helps her up and
asks her to stay, saying that it'll be fun. She tells him that he can't
force her to stay, and he answers that, actually, he can, before tossing her
on a wall telekinetically. He continues, telling her that he can do whatever
he wants, but she'll stay because it's the only way she's going to find
David, and then leaves with a girl.

Outside Gabrielle's house, Cyclops rides his motorcycle out of the Blackbird
to where Professor X and his ex-wife are standing. Storm joins them flying
down and says that she saw no sign of Jean or the boy, but she did spot the
glow of some fires burning toward the cliffs. Gabrielle explains that that
must be the McFadden Castle, as teenagers have been using those ruins for
parties. Cyclops decides to go and look for Jean, and Xavier tells him to be
cautious - three people are already missing and they don't need a fourth.
Scott rides away, and Xavier suggests that in the meanwhile, they'll search
for Ian – he might know more than he's let on.

At McFadden Castle, Scott arrives. He leaves his bike outside and enters,
making his way through the partying teens. He passes a wall, and there Jean
pulls him out of sight, telling him that David is there somewhere. He asks
her what happened to her, and she answers that she was following Iain and
that's when Lucas showed up. He asks who Lucas is, and she points to him,
saying that he's the kidnapper. Scott decides to go confront him, despite
Jean's telling him that his powers are too strong. Lucas notices Scott and,
after teasing him, sends him flying across the ruins. Jean rushes to him,
but Lucas stops her. Scott shoots an optic beam, but Lucas creates a force
field and is un-hit. He then keeps tossing Scott into walls, and Jean too
when she tries helping. Scott is knocked out and gets tied up with a helmet
covering his eyes, and Jean is thrown to the dungeon. Lucas tells her that
she's not powerful enough to escape, closes the opening and leaves.

In the street, Storm, Xavier and Gabrielle are driving the X-Van, searching
for Ian. The fog makes it hard to see, so Storm uses her powers to make it
clearer, and suddenly Ian is seen right in front of them. Storm manages to
go left and not hit him just in time and then stops the van. They all rush
out and Gabrielle asks Ian what he's doing out there, and Xavier tells him
that they just want to find out some information. Xavier tries scanning his
mind, but something's blocking his efforts to reach in, almost like a mutant
power. He tries again, this time touching Ian's head, and sees flashes of
flames, David, Lucas, Ian and McFadden Castle. He tells Storm that they're
at the ruins, and then Ian runs away towards the castle. They try chasing
him, but he creates a firewall between them, and Gabrielle states in shock
that he's a mutant. Xavier says that he's afraid his loyalties are with
David's abductor.

At the McFadden Castle dungeon, Jean sends a telekinetic blast, trying to
break the walls. In the next room, David hides as the wall between them
breaks and Jean floats in. He asks her who she is, and she answers that
she's a friend of his father's. David is surprised that he actually came,
and Jean tells him that they have to get him out of there. She levitates
them both through the hole in the ceiling and asks him how to get out, and
he says they should walk until they'll hear music. She says that she wishes
she could just send a signal to his father, but David doesn't think he'll
care. Jean tries explaining that Xavier is a good man, and David says that
it's his fault he doesn't know him. Jean corrects him, saying that it's his
mother's fault, as she never told him, but David says that Lucas said he's
one of the most powerful telepaths in the world, so how could he not know?
Jean is surprised at Lucas's name and asks David if Lucas knows the
professor, and David answers that that's what this is all about - so Lucas
can go brain to brain with the great Charles Xavier. They then hear music,
and start running towards it.

On the surface, Xavier, Storm and Gabrielle arrive and find Cyclops hanged
on a wall. They release him and remove the helmet, and Xavier senses that
Jean is near. He's right, as just then Jean and David show up. Jean runs to
hug Scott, and David runs to hug his mother. Gabrielle introduces David to
Xavier, and David hold out his hand and calls him "father". Right when
Xavier shakes his hand, though, David morphs into Ian and a fire ring
appears around them all. Jean asks Ian in confusion if he's David, and Ian
morphs into Lucas, saying that sometimes he is, sometimes he's not. He then
sends everyone but his father out of the ring to handle Xavier, while Xavier
uses his telepathy to tell the others not to attack. Lucas starts a speech:
"What do you think, Daddy? Am I a chip off the old mutant block or what? But
what do you care, right? You were so busy taking care of other people's
freaks that you never had time for your own! Well, take a good look,
Professor. I hope you're proud 'cause you made me what I am today." He then
ruins parts of the castle. Suddenly, he grabs his head and screams "no", as
he morphs into David. David hurries his father to get out of there before
Lucas comes back, but Xavier tells him that Lucas and Ian are a small part
of who he is, so he can take control of them. David says he can't, and the
professor offers his help, starting to work on David's mind. Inside David's
mind, Xavier is floating in front of David, Ian and Lucas. Ian attacks
Xavier, but he attacks back, and Ian disappears into a ball of light. The
exact same thing happens with Lucas, and then Xavier merges the balls of
light into a big one, and sends his hand to David to pull him away. The ball
catches David, and Xavier keeps pulling him out. Back in the real world,
David lies fainted, and the fire is out. They all surround David, and then
David morphs into Lucas. Xavier asks where David is, and Lucas answers that
he sent Ian and David away. Gabrielle asks Xavier what he did, and Lucas
answers that he did exactly what he brought him there to do – he was the
only one strong enough to get rid of the others. He then floats in the air,
and after saying that now he's free, flies away. Gabrielle starts crying.

At the Institute's hangar, Beast meets Xavier, Storm, Cyclops and Jean.
Xavier just wheels away sadly, and Ororo says that they'll have to give him
time. Jean asks Hank how things went with Kitty and Kurt, and Hank answers
that there wasn't a peep out of their rooms all day.

In Kurt's room, Kitty and Kurt teleport back. He's still asleep, and she's a
mess. He finally wakes up with a yawn and says that he's feeling much
better, though he had some weird dreams that they were out in public in
their pajamas. He then sees Kitty, wet, muddy and leafy, furious, and gets
scared as she hits him with the pillow and yells at him – the school,
downtown, in the park, at a funeral – she can't show her face in Bayville
again. He says that he's been in his room all day, and she just screams and
leaves.

On the balcony, Ororo walks to Xavier. He tells her that the tragic part is
that he lost him before he even found him. She tells him not to lose hope -
someday he'll find his way and he'll be there for him like he is for all of
them.