The final volume of Peter David's ever-evolving X-FACTOR! As Havok and Polaris take the reins of X-Factor Investigations, the Isolationist makes his chilling return! Then, when someone or something begins eviscerating super heroes in Seattle, X-Factor is called in to investigate. A departed friend returns! Madrox investigates a suicide case that isn't what it seems! Banshee is suspected of murder! Strong Guy asks M on a date! And after discovering a long-buried secret from the past, someone will be pushed to the brink of insanity! But when hell comes to Earth, the few remaining X-Factor members make a last-ditch effort to save the world - but not all will survive the final battle! One era ends - but years later, an All-New X-Factor is formed! Led by Polaris, they use their corporate backing for the betterment of society! Collecting X-FACTOR (2005) #233-262, ALL-NEW X-FACTOR #1-20 and X-MEN LEGENDS (2021) #5-6.