By James Hibberd
Updated January 31, 2014 at 09:00 PM EST
Credit: Lester Cohen/WireImage

With The Newsroom going into its final season, co-star Grace Gummer has signed on to CBS’ summer sci-fi thriller Extant.

In a series-regular role, Gummer will play one of John’s (Goran Visnjic) principal partners in building robot prototypes. The serialized drama stars Halle Berry as a female astronaut trying to reconnect with her family when she returns after a year in outer space.

CBS hopes the Steven Spielberg-produced Extant will deliver a big audience just like the network’s Under the Dome last summer. Dome returns Monday, June 30 and Extant debuts Wednesday, July 2.