UNEXPECTED TWISTS ARE IN STORE ESPECIALLY IN THE HANDS OF AN UNRELIABLE WITNESS, ON ABC'S "MISTRESSES"

"Unreliable Witness" -- Feeling under the weather, Karen heads to the doctor and is stunned when she gets the results. April and Blair move their relationship forward, even though Lucy admits that she's not fond of him. Marc continues to struggle with his old demons, but Harry is there to help him get back on track. Joss scrambles for evidence against Calista and when Calista twists the story to her benefit, the future looks very grim for Joss, on "Mistresses," THURSDAY, AUGUST 6 (9:00-10:00 p.m., ET).

"Mistresses" stars Yunjin Kim as Karen Kim, Jennifer Esposito as Calista Raines, Rochelle Aytes as April Malloy, Jes Macallan as Josslyn ("Joss") Carver, Brett Tucker as Harry Davis, and Rob Mayes in the role of Marc Nickleby.

Guest starring are Corinne Massiah as Lucy Malloy, Brian White as Blair Patterson, Corey Sevier as David Hudson, Jarod Joseph as Wilson Corvo, Andrew Airlie as Father John, Samantha Ferris as Detective Libby Whitehead, Christine Willes as Patty Deckler, Gabe Khouth as Crappy Lawyer, Francoise Yip as Doctor, Gabriela Zimmerman as Maritza Rubio, Merrilyn Gann as Sandra Bowler, Aren Buchholz as Teddy and Stormy Ent as Denise.

"Unreliable Witness" was written by Jenna Richman and directed by Eric Laneuville.

"Mistresses" is broadcast in 720 Progressive (720P), ABC's selected HDTV format with 5.1 channel surround sound. A TV parental guideline will be assigned closer to airdate.