After the Fall
Cordelia first appears as part of the demon army sent by the Senior Partners at Wolfram and Hart in the last episode of the Angel TV series. At some point in the battle, unseen, she is tamed by Angel.
She plays a supporting role in the eight issue series 'Spike' as the title character investigates a demonic investigation in Las Vegas. Partnered with Groosalug, they take care of the invasion's ariel force.