Benedict Cumberbatch's 'Prisoner 760' adds Zachary Levi

"Shazam!" star Zachary Levi has boarded the cast of Benedict Cumberbatch-starrer incarceration drama "Prisoner 760".

To be directed by Kevin Macdonald, the movie is touted as "a fight for survival against impossible odds". It is currently being shot in South Africa.

Besides Cumberbatch and Levi, the film will also feature Jodie Foster, Tahar Rahim and Shailene Woodley, according to The Hollywood Reporter.

The story follows Mohamedou Ould Slahi (Rahim) who, after being captured by the US government, languishes in prison for years without charge or trial.

"Losing all hope, Slahi finds allies in defense attorney Nancy Hollander (Foster) and her associate Teri Duncan (Woodley). Together, they face countless obstacles in a desperate pursuit for justice. They are aided by a military prosecutor named Lt. Stuart Couch (Cumberbatch)," read the official logline of the film.

Levi, 39, will portray the role of federal agent Neil Buckland, who is an old friend of Couch.

The movie is based on Slahi's best-selling memoir "Guantanamo Diary". Michael Bronner has penned the screenplay.

"Prisoner 760" is being produced by Cumberbatch along with Adam Ackland and Leah Clarke through their company SunnyMarch.

Other producers are Lloyd Levin and Beatriz Levin of Black Sheep Pictures, Mark Holder and Christine Holder of Wonder Street, and Branwen Prestwood Smith.

Slahi serves as a co-producer.