Danny Boyle's post-apocalyptic horror sequel is in cinemas on June 20
He said screenwriter Alex Garland had “extraordinary” ideas about expanding the plot to two more films
The director described the sequel as "a very, very British film"
"I shouldn't give away too much. I'll get killed"
Other signees include Danny Boyle, Annie Lennox, Tracey Emin and Holocaust survivor Stephen Kapos
The British actor plays a cult leader in the horror sequel
"About to make my nightmares look like sweet dreams"
The 'Oppenheimer' actor was the star of the original '28 Days Later'
Danny Boyle has also confirmed he will return to direct the third entry in the new trilogy
The latest movie in the ‘28 Days Later’ franchise, it will be released on June 20 next year