To celebrate the silver anniversary of 'Big Brother' on July 5 and the Season 27 premiere on July 10, Gold Derby looks back at fan-fave couples like Rachel & Brendon and Jeff & Jordan.

Big Brother hits its 25th anniversary on Saturday, July 5, just five days before the premiere of its new season on Thursday, July 10. And the show’s Season 1 viewers would hardly recognize the CBS reality show in Season 27.

Big Brother celebrates 25 years with two seasons and a documentary revealing incredible behind-the-scenes details. You won't believe what the future holds!

It's officially time to expect the unexpected with Big Brother summer. Here's all you need to know this season.

Since its premiere on July 5, 2000, Big Brother has continuously evolved, tweaking its gameplay and format while delivering many twists and turns. This constant evolution aligns perfectly with host Julie Chen Moonves ' iconic reminder each season: "expect the unexpected."

As Big Brother celebrates 25 years on air, here is a look back at the wildest moments from the show’s dramatic history.

In the weeks leading up to the premiere of 'Big Brother' 27, CBS teased a 17th mystery houseguest. The identity of that person has now been revealed.

"Big Brother" is back this summer with Season 27, where the official theme will be "Big Brother: A Summer of Mystery."

In addition to the three episodes a week schedule, "Big Brother: UNLOCKED" will air every other week throughout the season, where three BB All-Stars will offer commentary on the events of the game. The first episode will air at 7 p.m. CT Friday, July 25.

From record-setting legends to recent favorites, here are the previous houseguests that the new group of players identifies with the most.