Angelo's relationship with Bay is tested as he fights for custody of his infant daughter. Elsewhere, Daphne and Jace stumble onto a possible political scandal; Nikki learns that Toby's reconnected with Simone; and Emmett sets up a blind date for his mom.

Daphne organizes a Senior Ditch Day, which gets out of hand. Bay secretly grapples with her mortality.

Daphne’s correspondence with Quinn starts to affect her relationship with Mingo.

With tensions running at an all-time high, the Black Student Union takes a stand against the university administration until their demands are heard. Told in three chapters from the varying perspectives of Sharee, Iris and Chris, the students deal with their frustrations in different ways. Iris pledges to continue her hunger strike until the students responsible for a racist display outside the Black Student Union are expelled, but her commitment has consequences on her health. Sharee faces the pain of her own past as she tries to gather signatures and rally more students to get involved. Chris is torn between wanting to dazzle several baseball scouts at an upcoming game and standing with his fellow students to show solidarity.

Angelo becomes a member of the country club. Meanwhile, Regina begins a new job; Kathryn's position as a senator's wife leads her to have an awkward encounter; Daphne is unsure about Jace's feelings; and Bay uncovers new info about Ty and Mary Beth.

Bay and Daphne host a bachelorette party for Nikki. Meanwhile, Toby's bachelor party goes off course because of Simone; Jennice makes some surprising requests for the wedding; and an altered living arrangement has Angelo and Regina reexamining things.

Bay enrolls in an experimental program at Carlton for siblings of deaf students. Elsewhere, Toby embarks on a romance with Nikki, but then he pulls back after he finds a distasteful picture of her on the Internet; and Regina learns about Angelo's baby.

Bay becomes curious about her birth father. Meanwhile, Kathryn deals with her nosy neighbors; and John takes an interest in Daphne's basketball games and meets Melody (Marlee Matlin), a friend of Regina's who works at Daphne's school.

Daphne follows Emmett to a music festival, hoping to get some private time with him. Elsewhere, John requests that Regina be present when Bay sees Angelo again; and Kathryn secretly talks to a nurse who could assist in the lawsuit against the hospital.

Melody attributes Emmett's troublemaking behavior to Bay. Elsewhere, Regina becomes Angelo's business partner; Daphne's displeased with her basketball coach; and Kathryn and John face a possible setback in their lawsuit because of their lawyer.

Emmett photographs Bay and Daphne's blended family for a school assignment. Meanwhile, Regina gets acquainted with an art-gallery owner; Daphne questions Simone's trustworthiness; and Bay and Emmett divulge their true feelings to each other.

After a photo of Daphne and Mingo dressed up as their favorite singers at a college costume party goes viral, the pair find themselves caught up in a controversy that escalates into a discussion of race relations and free speech. Bay seeks a job at the tattoo parlor in town. Kathryn and John court a new shortstop for the UMKC baseball team, while Regina and Luca work on a class project together.

Daphne and Bay are so enthralled with China that they stay longer than anticipated, but after 10 months, they get an emergency call and drop everything to return home. Once there, Daphne tries to integrate herself back into campus life but finds that things have changed without her. Bay is mixed up about her feelings towards Emmett who is struggling with his own problems. Meanwhile, Kathryn and John quarrel over her job and Regina feels guilty about a secret tryst.

Kathryn questions why Regina isn't joining in the lawsuit against the hospital. Meanwhile, Daphne goes out with Liam and encounters new difficulties dating a hearing person; and Bay finds a kindred spirit in Ty, who hails from Daphne's old neighborhood.

Kathryn hosts a fund-raiser for Buckner Hall, and Toby's band provides the evening's entertainment. Meanwhile, Daphne is crushed to find out that she's been dating Bay's ex-boyfriend; and John and Melody's new friendship makes Kathryn uneasy.

Daphne and Bay unite to help Emmett save his motorcycle. Elsewhere, Kathryn and John retain a new lawyer for their case against the hospital; and Angelo learns something that could jeopardize his business arrangement with Regina.

Angelo attends a dinner at the Kennishs' home. Meanwhile, Bay helps Emmett move into his dad's place, where they meet his father's girlfriend; and Daphne and Wilke go out on a date.

Daphne is unsure about her romance with Wilke, and then she meets a confrontational new student at school. Meanwhile, Emmett isn't happy to learn that Bay is still in contact with Ty, who may have been injured in Afghanistan.

Bay and Daphne arrange an ASL zombie movie shoot for Emmett's birthday. Meanwhile, Emmett wrestles with whether to tell Bay about his betrayal; and Regina has doubts about assisting with Kathryn's book.

After a night of drinking with her friend Tank (guest star Max Adler, “Glee”), Bay wakes to find that she doesn’t remember all the details of the night. She tries to piece together the events of the evening, but as she speaks with different people about the situation, what really happened may not be so clear.

Returning from London for a visit, Toby and Lily reveal their plans to get married in the Kennish backyard. But a fight before the wedding may tear them apart before they can say “I do.” Regina must decide whether to reveal her relationship with Luca to the family. When she least expects it, Bay runs into Tank again.

Daphne and Sharee are horrified to stumble upon a racist display at the Black Student Union on campus. When the perpetrators are given minimal punishment, Iris starts a hunger strike in protest. Daphne receives an anonymous threat and Sharee grows frustrated with how the school is handling the situation. Emmett invites Bay to help him with an art project, causing friction with Travis who’s already upset that John seems ready to replace him on the baseball team.

In the series premiere of this drama, a hospital error that involved sending two newborns home with the wrong families is uncovered years later, when the girls are teenagers. The girls went on to lead very different lives: Artistic Bay Kennish (Vanessa Marano) grew up in a world of privilege, while athletic Daphne Vasquez (Katie Lecleric) was raised by a single mother and contracted an illness that left her deaf at a young age.

Daphne takes a volunteer job at a clinic for extra credit and comes face-to-face with her old mentor, Dr. Jackson. While eager to mend fences with him, she grows alarmed when it becomes obvious he’s having trouble properly treating his patients. Mingo leads the annual “Kangaroo Krawl,” but Daphne sees his foolhardy behavior as a reaction to the regretful costume party incident. Bay finds Noelle is plagiarizing her work and uses the discovery to negotiate her own chair. John and Kathryn make an effort to rekindle their romance. Regina is put in a precarious situation when she decides to expand her business.

As the Kennish and Vasquez families prepare to celebrate Christmas in their traditional ways, Bay and Daphne find themselves living each other's lives as if the switch never happened on an all-new holiday-themed episode.