Jack O'Connell has replaced Jamie Blackley in the role of the young hero Calisto in the 300 prequel, provisionally titled 300: Battle of Artemisia, which is set to start shooting in Bulgaria later this month.
300 was the hugely successful adaptation of the cult graphic novel series by Frank Miller and Lynn Varley set in ancient Greece, featuring an epic array of Persians, Spartans and Greeks.
Calisto, a 16 year old whose desire to become the heroic man/soldier his father was, leads him to become the leader of a small band of soldiers. The film will also star Eva Green as Artemisia, and Australian actor Sullivan Stapleton as Themistocles.
Jack himself recently had to drop out of a role in Beautiful Creatures filming in the US due to visa issues, which may well have made him once again available for 300.
Represented by Conway Van Gelder, he will next be seen this year in the Michael Morpugo adaptation Private Peaceful, and then in The Liability.