Professor Kass: "I'll have to give you an incomplete. I'll have no other choice. Now, do you have anything else to say to me?"
Phoebe: "I'm not wearing any underwear."
Phoebe talking to her professor while infected with Lust.[src]

Professor Kass taught Phoebe Halliwell's ethics class. Because Phoebe missed so many classes and a big report, he and Phoebe had a meeting to discuss her options.


Before her meeting with the professor, Phoebe was infected with Lust, and soon began flirting and sexually advancing on him, going to far as unzipping his pants with her teeth. After the whole ordeal, Phoebe explained to her professor that her indiscretion was merely a sexual politics experiment and he gave her a B-.


Professor Kass appeared in a total of 1 episode over the course of the series.