Supergirl: Wings (2001) #1

Matrix, an angel, has lost her way in her mission of caring for human souls. Wanting to disassociate from humanity, she is taken down a road of self-discovery that ultimately brings her closer to one soul than any other—that of Linda Danvers. Along the way, Matrix finds aid (and obstacles) from several other members of the DC Universe, including Zauriel, the Phantom Stranger, Aquaman, Clark Kent and the Spectre.