Everyone is looking forward to commencement until shocking news about Carlton threatens to overshadow their special day. Daphne fears her future is in jeopardy when her past catches up with her. John and Kathryn are not happy when they learn about Bay's non-traditional post-graduation plans. Meanwhile, Mary Beth is pleased when Travis's wish comes true.
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, while Daphne Vasquez, who lost her hearing at an early age due to a case of meningitis, grew up with a single mother in a poor neighborhood. Things come to a dramatic head when both families meet and struggle to learn how to live together for the sake of the girls.