Mark returns to Erinsborough twenty-five years later to meet with Jack Callahan (Andrew Morley), who is conflicted about whether to return to the priesthood. Mark meets Lucy Robinson, who is also in town for the Lassiters wedding expo, and they reconnect over their shared history. Mark extends his stay and they eventually rekindle their relationship, despite Lucy's concerns about Mark's commitment to his faith. When Mark learns that Lucy has to return to the United States for work, he decides to propose to her and move to New York, so they can be together. Mark and Lucy have a ceremonial wedding on the first day of the expo, before leaving for New York, so Mark can meet Lucy's daughter, followed by a visit to Las Vegas for Lucy's job, and eventually Paris for their honeymoon.