Ah. I increasingly understand the reason for the "X-Men." It's not Xavier or the X-Gene. The "X" is a target pasted on our backs. 
Appearing in "Everything Is Sinister! (Part 2)"
Featured Characters:
Supporting Characters:
Villains:
- Mr. Sinister (Main story and flashback)
Other Characters:
Locations:
Items:
Vehicles:
Synopsis for "Everything Is Sinister! (Part 2)"
The X-Men fight an army of Sinisters in Sinister's "World-Fair." Suddenly, Brand contacts Cyclops, telling him that they have Celestial problem. Cyclops tells her that it's about Siniester and the Dreaming Celestial's head, but Brand reveals that it's not about that. She tells Cyclops that the rest of the Celestials are going to Earth. Suddenly, a Sinister soldier tells Cyclops that His Majesty Sinister wants to see the X-Men in the rotunda to suggest an armistice due to the arrival of the Celestials. Emma tells Cyclops that it's a trap, and Cyclops agrees but it is also a ceasefire because it gives them time to evacuate the city.
As they proceed to the rotunda, Cyclops suggests to Emma that she should return to Utopia since she has lost her left arm, but Emma says she will be fine as long as she is in her diamond form. She also suggests that Colossus keeps his Juggernaut helmet on in case Sinister attempts a telepathic attack on them. The X-Men meet up with Sinister, who casually greets them. However, Scott bluntly asks Sinister about his intentions. Sinister explains that when he was a boy, he wanted to make a heaven on Earth, and when he became Sinister, he suddenly came up with the plan to do so. Using the Celestial, he could create clones of himself. Those clones would then create a perfect world, or at least the closest thing there is to a perfect world.
Cyclops informs Sinister about the Celestials, but Sinister replies that the Celestial are not of his concern. Storm also assumes that the reason Sinister brought them for a meeting was just an excuse to gloat, which Sinister confirms. Then, he uses his hive mind powers to telepathically control the X-Men. Under Sinister's control, Cyclops strips Colossus of his helmet, allow Sinister to control him. Then, the Sinisters blast Danger to pieces, and Emma tries to escape. Hope mimics Emma's diamond form and Magik's teleportation to escape. Emma is surrounded by the Sinisters. Just as the main Sinister continues his gloating, Hope shoots him in the head, having teleported to a safe distance.
With the main SInister down, the X-Men regain their senses and continue the battle. However, another Siniester reveals that all the Sinisters are the same intelligence and there is not a single Sinister controlling them.