9. Big Brother 4
Spicing things up in the house, Big Brother 4: The X Factor brought in five ex-boyfriends and girlfriends of Houseguests to compete for the $500,000 grand prize. The top finalists Alison Irwin (left) and Jun Song (right) managed to put aside personal feelings to play a manipulative, ruthless game. The other contestants may not have liked it, but Jun couldn’t really be bothered as she won the game!
Watch every season of Big Brother on CBS All Access.