An Australian beverage distribution plant owner and film producer whose wealth and extravagant lifestyle stir up trouble in Nantucket when he arrives with his wife for the summer.

The self-centered and hedonistic wife of Bull, known for her extravagant spending and social climbing as they attempt to become part of the Nantucket elite.

A young woman with a background in poverty who aspires to be a screenwriter and takes on a job as the Richardsons' "personal concierge" by misrepresenting her familiarity with Nantucket.

Part of the close-knit "Castaways" friend group on Nantucket, maintaining long-term relationships and representing the community's established residents with her husband, Ed.

A wealthy member of the local elite and the Field and Oar Club in the "Castaways" group, whose status attracts the attention of newcomers.

A member of the "Castaways" and close friend within the group, who faces frustrations due to social exclusivity and is protective of the group's dynamics.