Switched at Birth tells the story of two teenage girls who discover they were accidentally switched as newborns in the hospital. Bay Kennish grew up in a wealthy family with two parents and a brother. Meanwhile, Daphne Vasquez, who contracted meningitis and became deaf at an early age, grew up with a single mother in a working-class neighborhood. Things come to a dramatic head when the families meet and struggle to learn how to live together for the sake of the girls.
This season, the families must deal with the arrival of Bay's biological father Angelo (Gilles Marini), inflaming old passions and creating new rivalries. During their lawsuit with the hospital, the Kennishes find an unlikely ally in Angelo. But can he be trusted? Everyone struggles to navigate the complicated family dynamics as the girls clash in a love triangle with Emmett.

Lea Thompson has established a career that encompasses film, television and theatre.