In the third-season opener, the girls begin their senior year at Carlton, where Toby takes on a coaching position. Meanwhile, Kathryn befriends a tap dancer; Daphne starts her probation work at a free clinic; and Bay's new art teacher inspires her.

Bay strives to impress her art teacher while she struggles with her commitment to field hockey. Elsewhere, Campbell assists Daphne when she makes an error at the clinic; Kathryn invites Renzo home for dinner; and Emmett investigates a vandalism problem.

Daphne searches for a patient she accidentally let leave. Meanwhile, Bay discovers that Emmett is dating again; Jorge wants Daphne to accompany him to a family gathering; and Regina and Angelo have a discussion about business.

John bonds with Nikki's mom while they help Toby move into his new apartment. Elsewhere, Kathryn goes to New York City to pitch an idea for a second book; Bay suspects that Tank has a crush on her; and Daphne worries about Sharee's home life.

Daphne plans a birthday bash for Campbell. Meanwhile, Kathryn hosts a murder-mystery party, where she and John uncover surprises about one another; and Bay wants to score an invite to Tank's fraternity luau.

Daphne wants to help Sharee search for her mom, but problems arise. Elsewhere, Bay and Toby try to get their folks to stop beings at odds with one another; Regina's new project leads to a disagreement with her mother; and Travis' actions puzzle Melody.

Daphne asks to take on more work at the clinic as she contemplates studying premed in college. Elsewhere, Bay tries to measure up to her art teacher's expectations while dealing with her injury; and Travis invites his girlfriend to a dance at school.

Daphne assists Angelo with a fund-raiser at the clinic. Meanwhile, Bay can't ignore MaryBeth's feelings for Tank; Sharee is tutored by Toby; and John and Katherine entertain John's old baseball buddy.

Toby gets an unexpected visit from Nikki. Meanwhile, Bay and Daphne get ready for a big field-hockey game, and the rivalry between their team and the opposition intensifies; and Regina's connections to her old neighborhood prove beneficial.

Kathryn's book is leaked before it's published. Meanwhile, Bay is skeptical about Emmett's new girlfriend; Daphne has an unexpected encounter at the clinic with someone from her past; and Regina feels a sense of guilt about her behavior.

Melody wants to put an end to Emmett getting bullied by Matthew. Meanwhile, Bay feels torn between her feelings for Emmett and Tank; and Daphne is determined to hunt down the individual who vandalized Regina's studio.

A shocking discovery is made by Bay and Emmett when they challenge Matthew's threat of blackmail. Elsewhere, Daphne gets a promising opportunity at the clinic, but she's concerned about how it may impact Campbell; and Kathryn's past haunts her.

Emmett gets surprising news at his dad's housewarming. Meanwhile, Travis meets his hero, football star Derrick Coleman; and Regina persuades Daphne to go out for a Latina college scholarship.

Toby comes home from Iceland with a new career goal. Meanwhile, Bay gets unexpected news concerning college; Angelo has Daphne alleviate stress by focusing on a baking challenge; and Regina faces an ethical dilemma regarding the East Riverside project.

The Kennish and Vasquez families rally to support a loved one who is in critical condition. Amid the emotion, blame is placed, decisions must be made and lives are forever changed.

John brings Daphne and Bay to Chicago to tour Northwestern. Kathryn entertains baby Abby and Leo to help Regina.

Daphne lashes out at Regina. Bay tries to mend her friendship with Tank.

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

Daphne is going off the deep end and has everyone worried. Emmett plans the perfect prom but Bay feels she must take a stand which might mean no prom at all. Toby must choose between his new roommate Tank and a DJ gig.

Graduation day has arrived, but Daphne is distracted by the impending hearing over her parole violation.

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.