Air date: 2009-12-01

Runtime: 43 min

The Season 4 opener introduces seven new "bad girls"—Annie, Flo, Kate, Kendra, Natalie, Portia and Amber—who swoop in on a luxury Los Angeles mansion and try to coexist with one another.

Air date: 2009-12-08

Runtime: 43 min

Self-proclaimed house leader Natalie is in for a rude awakening when the other Bad Girls won't bend to her ways, leading to an explosive battle that could send one of them packing. While the other girls resist various attempts at house dominance by Natalie, Kate quickly discovers her inner Bad Girl when she stands up to the house dictator. Kendra and Natalie's budding alliance is threatened when the two come to blows during an explosive argument.

Air date: 2009-12-15

Runtime: 43 min

Flo unleashes her wrath upon the house when she is unexpectedly betrayed, while Kendra makes a shocking decision that rips the house in two.

Air date: 2009-12-22

Runtime: 43 min

A battle between two of the roomies will result in someone going home.

Air date: 2010-01-05

Runtime: 43 min

The new girl Lexie arrives at the house and is already asked to choose sides.

Air date: 2010-01-12

Runtime: 43 min

Kate's boyfriend Paul visits, bringing out the worst in Natalie, and prompting Kate to defend her man's honor; Flo's disapproval of Kendra's promiscuous lifestyle leads to a confrontation between the two.

Air date: 2010-01-19

Runtime: 43 min

When Flo sets out to woo a woman, an appalled Amber's disapproval of Flo's same-sex desire ignites a fiery confrontation that might change the house dynamics for good. Meanwhile, the ladies pose for a photo shoot, and they reassemble with the baddest "bad girl".

Air date: 2010-01-26

Runtime: 43 min

Alliances continue to shift in the house while Annie becomes empowered.

Air date: 2010-02-02

Runtime: 43 min

Kate's relationship with Paul is doomed after she has a bisexual experience, while Natalie and Flo become fierce rivals.

Air date: 2010-02-09

Runtime: 43 min

Flo's toxic attitude continues to alienate the girls, leading to the most shocking goodbye in Bad Girls history. Meanwhile, Natalie gains Amber's respect during a street brawl between Amber and a club patron. Amber's boyfriend visits, giving Amber a new sense of hope for their relationship.

Air date: 2010-02-16

Runtime: 43 min

The ladies head to Santa Barbara for a girls' getaway and a respite from thorny mansion politics. But there's a collision course of egos and wills between Kendra and Natalie, resulting in a no-holds-barred street fight.

Air date: 2010-02-23

Runtime: 43 min

A fight takes place and a family visits.

Air date: 2010-03-02

Runtime: 43 min

Annie is excluded from the plans of the rest of the house.

Air date: 2010-03-10

Runtime: 43 min

The girls catch up. Part 1 of 2.

Air date: 2010-03-16

Runtime: 42 min

The girls catch up. Part 2 of 2.

Air date: 2010-03-23

Runtime: min