1. Big Brother 5
These ten seasons of Big Brother brought us the most multifaceted Houseguests, the craziest surprises, and the deepest cuts of deceit. These seasons taught us what it truly means to play the game and solidified our Big Brother addiction.
The fifth season brought us twists galore thanks to Project DNA a.k.a. Project Do Not Assume. Weeks into the competition, the Houseguests learned twins Adria Klein and Natalie Carroll have been switching out and pretending to be the same person. Plus, Michael Ellis and Jennifer “Nakomis” Dedmon found out they were long-lost siblings.
Watch every season of Big Brother on CBS All Access.