UNSTOPPABLE (2007-2008)

The alien Ord revealed his belief that a mutant will bring about the death of his home planet, the cruel and unforgiving Breakworld (during X-MEN RELOAD). Ord even resurrected Colossus in order to use the Legacy Virus cure in his system to cure mutants of their powers and deny the prophecy. Instead, Colossus escaped and was reunited with his old flame Shadowcat (aka Kitty Pryde).

Since then, the X-Men have fought the sentient Danger Room (who took a humanoid form and the name 'Danger'), learned how Professor X suppressed Danger so she could carry out his intended purpose for her and come under attack from one of their own, Emma Frost. But Emma was being manipulated by the spirit of Cassandra Nova in a conflict that's left Cyclops powerless. Before anyone has a chance to figure out if they forgive Emma, the whole team along with Danger, Ord and trainee mutant Hisako Ichiki are teleported off-world...

Minor Crossover: This story arc runs through the Astonishing X-Men series before wrapping up in in a giant-size one-shot.

• Astonishing X-Men #19-24
• Giant-Size Astonishing X-Men #1

Astonishing X-Men #19

On the conquest-driven Breakworld ruled by Powerlord Kruun, the peaceful underground leader Aghanne has created a secret society that celebrates life. Kruun would wipe Aghanne's allies out if he discovered their existence. Having learned Colossus is destined to destroy Breakworld, Abigail Brand (Director of SWORD) has decided to hand him over to Kruun before his armada carries out their threat to destroy Earth. As a failsafe, Kruun has built a missile that's pointing at Earth from Breakworld's moon. It's the X-Men's job will be to stop it, defeat Kruun and save Colossus...

Astonishing X-Men #20

Equipped with maps and translators, the X-Men, Agent Brand and the agents of SWORD try to sneak onto the Breakworld in escape pods. Wolverine's pod is hit on the way down, separating him and Hisako Ichiki (who's taken the codename 'Armor') from Colossus and Shadowcat. Kruun sends his men in for the kill all the X-Men. Cyclops, Emma Frost, Beast and Abigail Brand discover a cavern where Colossus' image is etched in stone, smashing the Breakworld with the sun...

Astonishing X-Men #21
As Colossus and Shadowcat begin to discover how brutal Breakworld can be, they're taken to safety by agents of Aghanne who hopes Colossus will bring peace to her world. Abigail Brand keeps Beast get even closer. Danger offers her services to Powerlord Kruun and heads after Cyclops and Emma Frost. Emma openly invites Danger to kill her...

Astonishing X-Men #22

Emma Frost proves Danger can't kill the X-Men as it's against her programming and, instead, makes her an offer that Kruun never could. The X-Men, Brand and remaining SWORD agents are reunited. Lockheed is revealed to be a SWORD agent. Breakworld's moon turns out to be a giant missile launcher. Still powerless, Cyclops flies a ship out to distract the Breakworlders, only for it to be destroyed leaving him to die in space...

Astonishing X-Men #23
Powerlord Kruun has Cyclops resurrected (much the same way Colossus was by Ord) in order to extract information from him, including the whereabouts of the secret weapon Leviathan. Brand and Beast realise the 'sun' depicted in the image of Colossus is actually the planet's power reactor. 'Leviathan' turns out to be a trick Cyclops used to encourage his capture and resurrection. Alive and repowered, he unleashes his optic blasts on Kruun and frees himself...

Astonishing X-Men #24

Now the X-Men can focus on stopping the missile. Aghanne tries to force Colossus' hand to end her world, which it turns out was her plan all along. After suffering unimaginable punishment from Kruun for failing Breakworld, Ord  makes amends and kills his way through numerous SWORD agents. Brand takes a hit for Beast, saving his life. Having been offered Professor X by Emma Frost, Danger tries to change the missile's programming only to find it's protected by magic. Shadowcat enters the missile using her phasing power and finds it empty, apart from a hollow point. It's not a missile, it's a bullet! The X-Men fail and the bullet fires and hurtles towards Earth with Shadowcat on board...

Giant-Size Astonishing X-Men #1

Spider-Man, Doctor Strange, the Fantastic Four, the Avengers and the remaining X-Men fly to SWORD's orbital station, the Peak as the bullet makes its way to them. On Breakworld, Aghanne tries to force Colossus to destroy the planet. Ord ends up saving Colossus and killing Aghanne to save his world, dying in the process. The X-Men use a swift Breakworld spacecraft to chase after the bullet. Emma Frost is in telepathic contact with Shadowcat who uses her phasing powers to make the bullet intangible and pass through the Earth. The bullet carries on into space and Shadowcat is lost to the X-Men. Later, Colossus struggles to deal with the loss of his beloved Shadowcat wile Cyclops tries to figure a way to save her...

Astonishing X-Men #25 (2008) 

Despite her own initial concerns about her place among the team, Armor goes on her next mission with the X-Men team during MANIFEST DESTINY / GHOST BOX.

X-Men: Manifest Destiny #3 (2009)
Wolverine and Nightcrawler desperately try to figure a way to cheer Colossus up after losing Shadowcat in space during MANIFEST DESTINY.

Secret Invasion #1 (2008) 

The Peak is attacked again; Danger takes the opportunity to escape (behind the scenes) during SECRET INVASION.

Uncanny X-Men #507 (2009) 

Colossus comes to terms with the loss of Shadowcat during MANIFEST DESTINY.

X-Men: Manifest Destiny #4 (2009) 

Nightcrawler struggles with the guilt of not being there to save Kitty Pryde during MANIFEST DESTINY.

X-Men Legacy #220-224 (2009)

Danger tries to coerce Rogue into using her powers against Professor X; Professor X redeems himself with Danger by explaining how he tried to help her.

Uncanny X-Men #515 (2009) 

Danger joins the X-Men during NATION X.

SWORD #1-5 (2010) 

Abigail Brand reveals Shadowcat is still alive; still working for SWORD, Lockheed considers accepting help from the evil Unit into order to save Shadowcat; Beast's relationship with Abigail Brand continues to grow.

Uncanny X-Men #522 (2010) 

Magneto helps Shadowcat return to Earth but she's in a permanently phased state; Colossus and Shadowcat are reunited but can't touch during NATION X.

Uncanny X-Men #535-538 (2011) 

Kruun returns, leading the remaining inhabitants to Breakworld to Earth, looking for revenge against Colossus; Shadowcat is killed and resurrected by Kruun, restoring her powers to normal; the X-Men help relocate the refugee Breakworlders in San Francisco.

Astonishing X-Men #38 (2011) 

Lockheed and Shadowcat are reunited.

Uncanny X-Men #543 (2011) 

Shadowcat breaks up with Colossus when he gains the powers of the Juggernaut during FEAR ITSELF.

Wolverine and the X-Men #14 (2012) 

Colossus makes a last-ditch attempt to reconcile with Shadowcat after he gains a fifth of the Phoenix Force, but she rejects him during AvX: AVENGERS VS X-MEN.

All-New X-Factor #2 (2014) 

Danger joins X-Factor during All-New Marvel NOW!

Astonishing X-Men HC vol.2
Astonishing X-Men vol.4: Unstoppable

Astonishing X-Men by Whedon & Cassaday Omnibus
All include... 
Astonishing X-Men #19-24
Giant-Size Astonishing X-Men #1