Julie Chen Moonves returns to host Big Brother Season 27, which premieres with a 90-minute episode on Thursday, July 10 at 8 p.m. ET on CBS. A second 90-minute episode will follow on Sunday, July 13 at 8 p.m. ET. RELATED: ‘Survivor 50’ Cast Photos: All The Castaways Confirmed For CBS Competition

A new “Big Brother” theme will roll out when Season 27 airs with a 90-minute premiere on July 10, starting at 8 p.m. ET/PT, followed by another 90-minute Sunday episode on July 13. While CBS previously announced the new segment “Big Brother: Unlocked,

A first look at the 'Big Brother 27' house teases a mystery theme, a 'Mystery Houseguest' and twists that fans won’t see coming