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Big Brother Season 27 Launches ‘A Summer of Mystery’ on CBS and Paramount+

The season opens with a 90-minute premiere hosted by Julie Chen Moonves starring 16 new houseguests under the ‘A Summer of Mystery’ motif.

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Host Julie Chen speaks during the "Big Brother Season 10 Grand Finale" at CBS Radford Studios on September 16, 2008 in Los Angeles, California.
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Overview

  • The series debuted Thursday, July 10, at 8 p.m. ET with a special 90-minute episode airing simultaneously on CBS and Paramount+.
  • The ‘A Summer of Mystery’ theme introduces a masked visitor, a secret accomplice and an undisclosed mystery houseguest.
  • Live feeds will begin Sunday, July 13, at 9:30 p.m. PT on Paramount+ and Pluto TV for round-the-clock coverage.
  • Big Brother: Unlocked, a weekly aftershow, is set to premiere July 25 on Paramount+ and Pluto TV.
  • Julie Chen Moonves returned as host as 16 new contestants moved into the Sound Stage 18 house at CBS Studios Center in Los Angeles.