The Next Step studio is up against Elite Studios as the final two groups to perform at the regionals.
Isaac Dreyfus fights to prove his innocence, whilst Adam Freedman turns to a mysterious source for help get revenge for the murder of his wife and child. Nikki questions the motive behind the murders and a re-examination of the Freedman crime scene leads Jack to make a shocking discovery.
Larissa gives Carrie some harsh advice about her relationship with Sebastian. When Harlan asks Tom to work overnight on a top-secret case, Dorrit decides to throw an impromptu get-together, which quickly spirals out of control. Meanwhile, Mouse and Donna get surprisingly close and Sebastian makes a hasty decision after another fight with his parents.
Julia gets confronted by Ed and Joel steps in. Zeek makes a new friend while Camille is away. Drew remembers old feelings and Natalie gets jealous. Carl attends a fundraiser with Sarah and she is pleasantly surprised to learn more about him.
Jenny fills in for Mansfield's assistant, but she must then care for an ill Mansfield, who proves to be the world's worst patient. Meanwhile, Brody attends the most important meeting of his life without Mansfield, and power goes to Harvard's head when he supervises the downstairs crew.
Jeff returns to Greendale when his former law partner Alan Connor recruits him to gather evidence for a lawsuit he is pursuing. Dean Pelton is thrilled to see Jeff back at Greendale. Thinking he is there to help save the school, he quickly calls the study group back together - surprising Jeff with a reunion.
When Pennys big acting break on NCIS is a bust, Leonard struggles to help her, which results in Penny asking Leonard a bold relationship question. Meanwhile, Sheldon tries to learn how to be funny and Raj tries to work on his game before talking to girls.
The Garveys make it as far as Alicante airport before their holiday begins to go wrong. Donald and Jacqueline hold a protest after Joyce Temple Savage refuses to give them a room. Kenneth is left feeling scared by some strange messages hes been receiving. Liam and Lesley decide to intervene.
A trip back to the forest presents both a chance to return home as well as redemption for Andy.
Fashion and commerce collide as the All Stars work with design house Milly to create ready-to-wear looks to be sold for charity and the designers face a shocking twist on the runway. Guest judges are Kristin Chenoweth, Nick Cannon and Milly Designer Michelle Smith.
Don Wildman investigates a bright yellow car that once represented the promise of an automotive revolution, a mysterious musical instrument, and a strip of paper with a secret message that was passed across enemy lines.
Walden joins his beautiful former employee on a brilliant new project. Meanwhile, Alan advises Jenny to open up to her girlfriend or risk losing her.
Join the Pawn Stars Revolution when the guys check out an Annual Register from 1776. Including a printed copy of the Declaration of Independence, will they declare their intention to buy it? Then, Corey checks out a set of gambling tokens from the Nevada State Prison. The only legal casino to ever exist in a prison, will he put them on lock down? And later, when Chumlee's laziness reaches an all-time high, Rick sentences him to a week of hard labor.
Jerry Seinfeld and his special guest, Louis C.K., drive a Fiat Jolly to Louie's boat for some coffee.
As the Cold War enters its final act, the CIA is sent scrambling when a rendezvous with a prized asset goes horribly awry. CIA officer Sandy Grimes begins her investigation into the source of the problem and quickly discovers that this lost asset is just the tip of the iceberg. Little does she know that this is just the beginning of a decade-long mole hunt, and the mole is one of her cohorts - Aldrich Ames.
Holmes and Watson come face to face with Moriarty when their one-time adversary is brought in as a consultant on a kidnapping case. Meanwhile, Detective Bell continues his struggle on the road to recovery.
Emma and Maddie struggle to master their powers after discovering that they are witches the Sharks set off a smoke bomb to get out of taking a test.