Captain Britain brings together a new team of Excalibur after the events of House of M and the previous Excalibur series. The teams faces threats such as: Black Air, Lionheart, Black Tom, and the Dark X-Men.
The series lasted until issue 24, after witch which it was continued in the mini-series X-Men: Die by the Sword, which it crossed over with the Exiles.
- Vol. 1: Defenders of the Realm (#1-6)
- Vol. 2: Last Days of Camelot (#8-15)
- Vol. 3: Battle for Eternity (#16-24)