How this name came about is unexplained, and prior to this the team was called the Dark X-Men by fans, reviews, and even the Marvel preview descriptions.

When they were brought to Earth-616 the Dark Professor Xavier tried to bring Nocturne, Marvel Girl, and Shadowcat under his control, but he was defeated by them, with help from Sage, and later placed in Crossmore prison.

New Excalibur is short-handed because of Nocturne's recent stroke and Sage infiltrating Albion's ranks, but they are able to effectively work as a team and successfully take down Shadow-X.

[6] In the final battle against Albion, Dark Marvel Girl is mortally wounded while saving Nocturne's life.

Meanwhile, Lionheart helps Dark Iceman against the rest of the Shadow Captains before he dies and withers away into a skeleton.

In the alternate future mini-series Genext United, a group resembling Shadow-X appear to be alive and well in this continuity.