Mark is impressed with Lucy when she gives a talk about addiction at a youth centre, and they have dinner together. Mark and Lucy have sex, and he is tempted to forgo joining the priesthood to be with her. However, Lucy tells him that she needs to leave Erinsborough and she takes a job in New York. Lucy's departure sends Mark into a depression. After coming away from three minor accidents and a collision with a car unscathed, Mark feels that he is immortal. He alienates himself when his friends and neighbours become fed up of his lectures. When Mark slips and falls while cleaning Lou Carpenter's (Tom Oliver) gutters, he is left comatose for several weeks. He eventually regains consciousness, much to the relief of his sister, Serendipity Gottlieb who has been by his bedside. Mark suffers memory loss, but soon has flashbacks to his pious behaviour and realises he had become unlikeable.