The Comic: X-Factor by Peter David, with art by various.
What it’s about: Jaime Madrox, the Multiple Man, has a weird superpower. He can create seemingly endless copies of himself (“dupes”). Although a mutant, he is not a member of the X-Men, and instead forms X-Factor Investigations, a mutant detective agency. Together with a team made up of obscure and unloved X-characters (including Siryn, Polaris, Darwin, Longshot, M, Rictor, Shatterstar, Strong Guy, Wolfsbane, and Layla Miller), Madrox must solve mysteries that take his team to every corner of the Marvel universe.
Why you should read it: The most celebrated run of X-Men was that of Chris Claremont, which ran for hundreds of issues over 17 years. Since then, no one writer has come even close to such a long, unbroken run writing the mutants. Peter David comes close, though. This story came out in issues from 2005 to 2013, and the length is one of its greatest assets. The story allows itself to be character focused. You’re probably not a fan of every member of this team, and if you’re anything like me there are a few members you don’t like at all. But you will. David puts his team through hell (sometimes literally) and by the end of it, you’ve gone on one of the most epic journeys in the history of Marvel.
Also, did you know: Peter David had a tragic, debilitating stroke towards the end of his run. Determined to finish the story but unable to hold a pen, he dictated the rest of his scripts to his wife and loved ones, who helped him. The book was finished on time, with few delays, a feat that most healthy comic teams cannot pull off. Fortunately, Mr. David recovered miraculously and continues to write excellent comics.