Season 21 opens with eight strangers this season (not seven), moving into a home in Brooklyn.
The Brooklyn house heats up as the roommates begin to take their crushes to a new level.
An ominous phone call arrives for Sarah regarding her past.
Ryan is upset over a late-night prank which was pulled by JD.
Ryan wants to know the secret which Katelyn has been keeping from him.
The Brooklyn house receives a visit from Devyn's 'semi-fiance' while still stringing along another guy. Meanwhile, Devyn receives payback for her cheating ways when guys pull a prank on her.
Katelynn thinks seriously about quitting the show and heading home.
As election day 2008 approaches, Ryan discovers he has been called back into duty in Iraq.
Ryan's dreams are put on hold due to his news of redeployment to the war in Iraq. Meanwhile, the roommates head to Atlantic City, and Devyn gets a puppy.
The 21st season ends as the roommates say goodbye to the Brooklyn house.