SWITCHED AT BIRTH - "Switched at Birth," a one-hour scripted drama, tells the story of two teenage girls who discover they were accidentally switched as newborns in the hospital. (ABC FAMILY/BRUCE BIRMELIN) CONSTANCE MARIE, KATIE LECLERC, VANESSA MARANO, LEA THOMPSON, D.W. MOFFETT, LUCAS GRABEEL

The new network drama of Switched at Birth just got a bit more interesting. Marlee Matlin has been added to the cast of the upcoming series, which is set to debut on ABC Family this summer.

The series surrounds two teenage girls who discover there was a goof-up at the hospital where they were born and somehow they were sent home with the wrong families.

Bay Kennish (Vanessa Marano) grew up in a wealthy family with two parents (Lea Thompson, D.W. Moffett) and a brother (Lucas Grabeel), while Daphne Vasquez (Katie Leclerc), who lost her hearing at an early age due to a case of meningitis, grew up with her single mother, Regina (Constance Marie), in a working-class neighborhood.

Naturally, things get complicated when the families meet and begin the struggle to learn how to live together for the sake of their daughters.

Matlin will appear throughout several episodes as Melody, the mother to Emmett (Sean Berdy) and best friend to Regina. Berdy, who is a deaf actor, has had his role elevated from the pilot to series regular. Katie Leclerc, who is a hard-of-hearing actress, portrays the role of Daphne.