Factor X is the only agency of mutant detectives in the world, and there is no shortage of business! Until we investigate the disappearance... of the Invisible Woman! But when the team suffers a tragic loss, she flies in bursts, leaving Jamie Madrox looking for a new meaning in her life. For her part, Felix discovers that she is pregnant... how Rictor, her ex-companies, will welcome this news? Contains the US episodes: - X-Factor (2006) 40-50 - Nation X: X-Factor (2010) 1 - X-Factor (1986) 200-232 and 224.1 Titles previously published in - ASTONISHING X-MEN 58-63 - MARVEL MONSTER: X-FACTOR – X-NATION - MARVEL OMNIBUS: THE RETURN OF MESSIA - X-MEN UNIVERSE 4-6 and 8-10 - X-MEN UNIVERSE HORS SERIE 1 and 3-5