That terrifying chant in the '28 Years Later' trailer and film is a 122-year-old Rudyard Kipling poem: director Danny Boyle explains why it's there.

Director Danny Boyle has admitted it was a "nightmare" filming naked zombies for his new horror movie, 28 Years Later. The moviemaker has stepped back into the director's chair to helm the new horror - written by Alex Garland - 23 years after the pair's first film, 28 Days Later, hit cinemas.

The last “28 Days” franchise film came 18 years ago after Danny Boyle’s first film in the series became a surprise hit in 2002.