DNA Films and Fox Atomic have rounded out the cast for “28 Weeks Later,” the sequel to Danny Boyle’s 2003 hit “28 Days Later.”

Robert Carlyle will topline, appearing with Rose Byrne, Catherine McCormack, Harold Perrineau, Imogen Poots, Idris Elba, 12-year-old newcomer Mackintosh Muggleton and the previously announced Jeremy Renner.

Pic has started shooting at Three Mills studio in London, helmed by Juan Carlos Fresnadillo.

The sequel picks up the story six months after a mystery virus has devastated the British Isles, wiping out most of the population.

DNA topper Andrew Macdonald and Allon Reich are producing with Fresnadillo’s regular partner Enrique Lopez-Lavigne. Boyle and “28 Days Later” scribe Alex Garland take exec producer credits.

This is the first project that DNA, which is a joint venture between Macdonald, Reich and Fox Searchlight, has produced for distribution via the studio’s new youth label Fox Atomic.

Spain’s Sogecine, which co-produced Fresnadillo’s 2001 feature debut, thriller “Intacto,” is a production partner as is Lavigne and Fresnadillo’s Koan Films shingle.

(John Hopewell in Spain contributed to this report.)