3x14 "The One with Phoebe's Ex-Partner"

Phoebe is reunited with her former singing partner (Elizabeth Daily), who thinks "Smelly Cat" has hit potential. Chandler dates a woman with a prosthetic leg (Sherilyn Fenn). Ross, who is getting sick of Rachel's long work hours, is happy to learn that Mark is leaving Bloomingdale's, just to discover Rachel is still friends with him and are planning to attend a fashion seminar together. In order to make sure Mark can't go, Ross accompanies her instead but then quickly falls asleep which causes a fresh argument and leaves the relationship on very rocky ground.