Halle Berry has revealed that she plays "a Jewish woman in the 1930s" and "an old tribal woman" in Cloud Atlas.
The Oscar-winning actress leads the star-studded ensemble cast, which also includes Tom Hanks, Hugo Weaving, Susan Sarandon, Jim Broadbent, Jim Sturgess, Hugh Grant and Ben Whishaw in the ambitious big-screen adaptation of David Mitchell's complex novel, which is co-directed by the Wachowski brothers and Tom Tykwer.
The 45-year-old also admitted she had difficulty keeping track of the movie's unconventional approach, telling the New York Times: "The biggest change for me as an actor is to have two different film units and two different film crews and to go between the two from one day to the next.
"Some days I go into the trailer, I'll be having a conversation - I won't even know it's with Hugh Grant until five minutes in," she added.
The film follows six plot threads across time - a 19th century notary on a Pacific expedition, a bisexual musician in the 1930s, a female journalist embroiled in a thriller in 1970s California, an ageing publisher in London in the present, a clone in a futuristic dystopia, and a Pacific survivor in a post-apocalyptic world - all of which fold in on themselves.
Other details have been kept under wraps, but the film continues to shoot and is expected to be released in cinemas next year.