X-Men history will be revisited and revealed when X-MEN LEGENDS #1 debuts next month. This first-of-its-kind series will feature the return of the franchise’s most influential creators—including Louise Simonson, Chris Claremont, and more— in all-new, in-continuity stories set during their groundbreaking runs. Starting things off will be Fabian Nicieza with a two-part tale that finally reveals the truth behind one of the most talked-about mutant mysteries: Adam-X and his startling connection to the Summers bloodline!

Introduced during Nicieza’s explosive work on the X-Men in their nineties heyday, the beginnings of this storyline can be traced back to 1993’s X-Men #23. Since then, X-Men fans have endlessly speculated, theorized, and debated what became known as the “third Summers brother” mystery. Now, all will be answered as one the most infamous comic book plot danglers of all time is resolved! Take an exhilarating trip through the history behind this iconic piece of X-Men lore in the action-packed X-MEN LEGENDS #1 trailer, featuring never-before-seen artwork!

“I am very glad I was able to tell this story in almost exactly the way I had always planned,” Nicieza told Comic Book Resources in a recent interview. “I knew who I wanted Adam to be, and I think this story will give readers a chance to see that. It’s a ‘big’ story that is also very intimate, sad, tragic and hopeful all at the same time. And it’s also got a tremendous amount of crunchy cool fun, as well!”

Each month, X-MEN LEGENDS will dive into the rich history of the X-Men to tie up loose ends, resolve long-standing plot danglers, and reveal shocking truths that will change the past and future of the X-Men! Don’t miss these revelatory tales when X-MEN LEGENDS #1 hits stand on February 17th! For more information, including an exclusive first look at interior artwork, visit Marvel.com.