Freida Pinto will star in “War of the Gods,” Relativity Media’s Greek mythology clash directed by Tarsem Singh with production set to start in April.

Story follows a young warrior Theseus who leads his men into battle with the immortal Greek gods to defeat evil and the powerful elder gods of the Titans in order to save mankind. The “Slumdog Millionaire” thesp will portray Phaedra, an oracle priestess who must join Theseus — played by Henry Cavill (“The Tudors”) — on his quest to prevent the cataclysmic war from erupting.

“War of Gods” will be produced by Gianni Nunnari of Hollywood Gang Prods., Mark Canton of Atmosphere Entertainment and Relativity topper Ryan Kavanaugh. Nunnari and Canton partnered on 2007’s “300,” producing the sword-and-sandals saga for Warner Bros.

Universal will handle the release. Relativity’s Tucker Tooley and Craig Flores of Hollywood Gang are exec producing.

Jason Keller penned the most recent draft of the script. The original screenplay was written by Christian Gudegast.

Relativity began developing “War of the Gods” when it bought a screenplay written by Charley and Vlas Parlapanides two years ago — about the same time as Warner Bros. and Legendary Pictures started moving ahead on “Clash of the Titans.”

Pinto’s upcoming films include Woody Allen’s “You Will Meet A Tall Dark Stranger,” opposite Josh Brolin and Naomi Watts, and “Miral,” directed by Julian Schnabel in which she plays the title part. Both have completed production.

She’s repped by CAA.