Returns dates set for "Big Brother" and Stephen King's "Under the Dome"
"Extant" means "still in existence, the opposite of extinct"
Halle Berry drama "Extant" will premiere July 2
Manheim will play the best friend of Halle Berry's astronaut character
Deal is similar to one for "Under the Dome"
Pierce Gagnon will play the son of Berry's astronaut character
"Monster's Ball" star will play an astronaut who returns to earth
Series follows a pregnant astronaut, back from space