Martin hired Zoe as a veterinarian in August 1990. In October 1990, Martin told Zoe about customer Sally Graves, a sick woman who keeps coming down to the vets, claiming her dog is dying. In March 1991, Archie Brooks, Michael Feldmann and Rachel Hughes discover that Martin has signed a contract with Skipdale Laboratories, allowing them to experiment on animals. They show Zoe proof, and she confronts Martin, who admits it. She threatens to resign but Martin lies that he's disassociated his company with them. However, in May, she discovers this lie, and he tells her he can't afford turn down business based on principals. As a result, Zoe quits her job.