• 'Mistresses' star Kim Yun-jin and director Kang Tae-kyu attend the 23rd Tokyo International Film Festival Opening Ceremony at Roppongi Hills on October 23, 2010 in Tokyo, Japan.

'Mistresses' star Kim Yun-jin and director Kang Tae-kyu attend the 23rd Tokyo International Film Festival Opening Ceremony at Roppongi Hills on October 23, 2010 in Tokyo, Japan. (Photo : Getty Images/Kiyoshi Ota)

"Mistresses" Season 4 episode 7 titled "Survival of the Fittest" will air on ABC on Aug. 2, Tuesday. In the episode, Alec Adams (Ed Quinn) sends Dr. Karen Kim (Yunjin Kim) into a panic.

Alec will threaten for full custody of Vivian (Sonja Bennett) in "Survival of the Fittest." On the other hand, Kate Davis (Tabrett Bethell) will not tell Josslyn Carver (Jes Macallan) and Harry Davis (Brett Tucker) about her new boyfriend considering its possible serious recuperations.

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There will be tension in the relationship between Josslyn and Harry. This is after the actions of the former put Reza (Micky Shiloah) in the hospital.

Reza is the nephew of the notable Persian entrepreneur named Jonathan Amadi (Navid Negahban). Also, April Malloy (Rochelle Aytes) will be forced to give "the talk" after she and Marc Nickleby (Rob Mayes) find a condom in Lucy's jacket.

Watch an interview with Macallan and Tucker here: