David Harewood joins 'Supergirl'

'Homeland' star David Harewood and 'Grey's Anatomy' actress Chyler Leigh are joining the cast of CBS's 'Supergirl' series.

The pilot will be based around Kryptonian Kara Zor-El (Melissa Benoist) embracing her superpowers after hiding most of her life, reported Entertainment Weekly.

Harewood will be playing DC Comics character Hank Henshaw, a former CIA agent who is put in charge of the US government's Department of Extra-Normal Operations.

Leigh has been cast as Kara's science-obsessed foster sister Alexandra 'Alex' Dancer.

'Supergirl' will also feature Laura Benanti, Calista Flockhart and Mehcad Brooks playing iconic DC Comics characters Alura Zor-El, Cat Grant and Jimmy Olsen.