Big Brother 27 houseguest Rachel Reilly came up with an absolutely diabolical scheme for winning the game, and her fellow contestants have no idea.

If Big Brother fans know anything, it's that no one comes between Rachel Reilly and her man, Brendon Villegas. The two met as houseguests on Big Brother 12, immediately connecting over their mutual passion for science,

Before the season 27 premiere, many fans speculated that the mystery houseguest could be anyone from Celebrity Big Brother UK star JoJo Siwa to a Big Brother newcomer like Tom Sandoval from Vanderpump Rules. Viewers even hypothesized that this season, the host herself, Julie Chen Moonves, would join the cast as a contestant.