"Q is for Quarry" is the seventeenth episode of the second season and the forty-third episode overall of W.I.T.C.H. It first aired October 7, 2006.
W.I.T.C.H. pursue Nerissa and her Knights of Destruction on Zamballa, unknowingly falling in her trap, and losing Kadma and the Heart of Zamballa in the process.
In the B-story, Will meets her father's girlfriend, Serena Sanchez and thinks she's another Nerissa's disguise, and she hires Blunk to spy on Serena.