"That's a world I don't even want to imagine," Chen Moonves responds when asked about a 'Big Brother' future without her

Contestants are gearing up to compete for $750,000 in the iconic reality show, Big Brother, which returns Thursday for its 27th season, “A Summer of Mystery.”

In a brand new photo, a "Missing" sign is shown and one single, silver high heel can be seen left alone on the stage floor.

The hit reality series Big Brother returns for its 27th season called “A Summer of Mystery.” Sixteen new house guests and a mystery player will check into the Hotel Mystère, but only one will check out with the $750,

Rachel Reilly is checking into the Hotel Mystère as the 17th mystery houseguest.

Season 27 premieres with a 90-minute episode Thursday, July 10, from 8:00-9:30 p.m. ET.