The Castaways airs Sunday on Channel 5

The upcoming thriller series 'The Castaways' on Channel 5 follows sisters Erin and Lori as they embark on a holiday to Fiji, only for their plans to unravel after a heated argument leads Erin to miss the flight. Lori boards but the plane goes missing, prompting Erin to seek answers months later when Lori's credit card is used in Fiji. The series, based on Lucy Clarke's novel, features filming locations in Fiji and Greece, where the production faced challenges such as extreme heat and fire bans during the summer. Producers aimed for authenticity in the filming locations, capturing a visceral sense of the environment. The narrative alternates between Erin's desperate search for Lori and Lori's struggle for survival among other castaways. Notable cast members include Sheridan Smith as Lori and Celine Buckens as Erin.