Gather up your zombie troops and fight for vengeance in Undead Knights, a new-style invasion action game for the PSP. Following a dark dissension between two royal families, the vengeful seek help from the devil, who grants them the power to recapture everything they had lost under the grim condition of eternal slavery. As a member of this clan, you have the unique ability to transform dead bodies into the living-dead - the Undead - and defeat the King!