Marvel Comics only recently debuted House of X and Powers of X, two interconnected miniseries aimed at radically reshaping the X-Men line. And already the these books are having a huge impact on the past, present and future of the mutant race. House of X #2 introduces one of the biggest X-Men plot twists in years, as Dr. Moira MacTaggert's deepest secrets are finally revealed.

Read on for a full breakdown of this issue and the new revelations about Moira and Charles Xavier. But beware ofahead!

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Who Is Moira X?

Art by Pepe Larraz. (Image Credit: Marvel Comics)

Moira's Past Lives

Art by Pepe Larraz. (Image Credit: Marvel Comics)

Art by Pepe Larraz. (Image Credit: Marvel Comics)

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Moira's Tenth Life

Art by Pepe Larraz. (Image Credit: Marvel Comics)

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This issue builds on an encounter between Moira and Professor X in last week's Powers of X #1, the same encounter Marvel previously teased as being " the most important scene in X-Men history ." Only now do readers learn what Xavier saw when he read Moira's mind. It turns out that Moira - long depicted as being one of the few humans completely loyal to the X-Men - is actually a mutant. Because of her odd, unnatural state of existence, her mutant status has never been detected before. Whenever she dies, Moira is reincarnated in utero, forced to relive her life all over again.In fact, by the time Moira confronts Xavier in Powers of X #1, she's on her tenth life cycle. This issue unfolds as Moira reflects back on her ten lives and her struggle to create a timeline where the mutant race grows and prospers.Moira's original life is happy and ordinary, with Moira dying of old age and having no inkling of the cruel fate awaiting her. It's only in her second life, that Moira becomes aware of her mutant power. Disinterested in trying to relive her original life, she attempts to travel to America to meet with Charles Xavier, but instead dies in a plane crash.Moira's third life is where she begins to develop her true sense of purpose. This is the first life where she devotes herself to science, eventually developing a mutant cure she hopes can end her never-ending cycle of death and rebirth. Instead, Mystique and the Brotherhood of Evil Mutants arrive to destroy Moira's lab. Destiny alone is able to sense Moira's mutant status and see the effects her reincarnations are having on the timeline. Destiny orders Moira to stop wasting her gift by working against her own kind, and instead help prevent a seemingly inevitable future where mankind's machines wipe out the mutant race. Destiny also tells Moira of her future, revealing that Moira will ultimately live either ten or eleven lives, depending on the choices she makes in the tenth cycle. With that, Destiny orders Pyro to burn Moira to death, promising that she'll continue to hunt Moira in each new life if she doesn't work for the betterment of mutantkind.Each subsequent life shows Moira trying and failing to establish a prosperous future for the mutant race, all while concealing her true nature. Her fourth life unfolds in traditional X-Men fashion, with Moira falling in love with Xavier, aiding the X-Men and eventually watching the mutant race be wiped out in a Days of Future Past-inspired future. In her fifth life, she approaches Xavier a decade sooner and urges him to create a fortified refuge for the mutant race. That, too, is eventually annihilated by Sentinels.Curiously, this issue avoids any mention of Moira's sixth life, either in the story itself or in the timeline chart included as a supplemental feature. No doubt there's a good reason Moira is keeping that particular story to herself.A disillusioned Moira dedicates her seventh life to systematically assassinating every member of the Trask family, hoping to prevent the creation of the Sentinels. However, she discovers that artificial intelligence is an inevitable result of the conflict between man and mutant. Now radicalized, Moira instead allies with Magneto in her eighth life. However, Magneto's mutant reign is brought down by the combined might of the X-Men, Avengers and Fantastic Four. Moira even tries joining forces with Apocalypse in her ninth life, but even he is no match for the futuristic hunter-killer Nimrod.Now in her tenth life, Moira is faced with the knowledge that she's running out of second chances. Based on Destiny's warning, this is either her final life or her next-to-last life. Moira knows her only hope is to try something more daring than ever before. And that leads to her latest "first" encounter with Charles Xavier in the park. Moira fully opens up her mind to Xavier, allowing him to see the nine lives she's lived and the seemingly inevitable future awaiting mutantkind.That's why this is "the most important scene in X-Men history." By showing Professor X the future, Moira has effectively changed the past ten years of the Marvel Universe. This act will almost surely have rippling effects across time, impacting Xavier's actions and decisions as he forms the X-Men and altering key events in the team's history. It probably explains why Xavier is behaving so strangely and aggressively as he spearheads the new mutant nation of Krakoa. Even he knows mutantkind doesn't have the luxury of waiting and seeking a peaceful solution.Exactly what Moira and Xavier are trying to accomplish this time remains to be seen, but Moira alludes to "something truly revolutionary" that will completely change the course of mutant history. It's no longer a question of whether Professor X or Magneto are right. The time has come for something bigger.For more on this ambitious X-Men relaunch, learn how to read House of X and Powers of X , and then check our our recaps of House of X #1 here and Powers of X #1 here

Jesse is a mild-mannered writer for IGN. Allow him to lend a machete to your intellectual thicket by following @jschedeen on Twitter