| 26 :04x01 - When Worlds Collide (1) (Sep/18/2007) | | The fourth-season opener adds some new twists as the third season's couple, Nate and Jennylee, join host Mike Richards to conduct a nationwide search for the contestants. The chosen 20 meet in the mansion and realize that they have to compete against their opposite---a geek gal and a hot guy. The housemates then pick their partners during a barbecue. | |
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| 27 :04x02 - When Worlds Collide (2) (Sep/18/2007) | | The twenty contestants move into the mansion together and are shocked by the season 4 twist -- they will be competing against one opposite pair, a hot guy and geeky girl. Later, the teams are chosen at a backyard barbeque. | |
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| 28 :04x03 - Opposites Attract (Sep/25/2007) | | The male beauty and female geek move into the mansion as the beauties and geeks study for their first challenge. The geeks must write and perform an autobiographical rap song for 3/6 Mafia while the beauties must study up on politics for a political debate about current events. After the winners are announced, one team is eliminated. | | Guest Stars: Three Six Mafia as Themselves | |
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| 29 :04x04 - Double Dare (Oct/02/2007) | | A celebration leads to the groups playing a wild game of Truth or Dare, and before the night is done, two housemates begin a romance. The second challenge is announced and the Geeks must create a romantic gift while the Beauties must study anatomy in order to locate organs on their partner. In the end, one couple is sent home. | |
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| 30 :04x05 - It's Not Rocket Science (Oct/09/2007) | | The beauties and geeks work out a plot to dethrone "King Geek," while the romance between two houseguests threatens one team. After America votes which challenge the contestants will compete in, the geeks must give a massage to their partner while the beauties build rockets. | |
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| 31 :04x06 - It's Good To Be King (Oct/16/2007) | | It's makeover time and the Geeks are each given shocking new looks. The Beauties head back to school -- well, third grade -- and the Geeks strut their stuff at the first Beauty and the Geek Prom. | |
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| 32 :04x07 - Super Geek (Oct/23/2007) | | The teams go to a comic-book convention, where they each must create a comic-book hero. The geeks design the costume, while the beauties come up with the story. | |
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| 33 :04x08 - A Look Back (Oct/30/2007) | | With only five weeks of competition left, a recap of the season until now, along with never-seen before scenes, are shown. | |
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| 34 :04x09 - Viva Mexico! (Nov/06/2007) | | The Beauties and Geeks head to Mexico. There, one Geek is able to let loose while another has issues with their partner. Later, the Beauties compete in a memory challenge and the Geeks face each other in a dance-off. | |
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| 35 :04x10 - Raising the Bar (Nov/13/2007) | | Pressure is rising as the teams are down to four. This weeks challenge for the geeks includes bartending. | |
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| 37 :04x12 - Meet the Parents (Nov/27/2007) | | The two remaining contestants go back to their hometowns to have their partner meet their parents. The contestants are shocked at the announcement of how the winner will be chosen. | |
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