Miss Kate and the Next Step dancers hold an Open House to welcome prospective new dancers to the studio. Meanwhile, some veteran A-Troupe members say their farewells as they prepare to move on.

Auditions for A-Troupe get underway, and Amanda and Eldon make big decisions. Meanwhile, Skylar and Cierra demonstrate their sisterly devotion to one another when they make a pact.

Guest choreographer, Stephanie, challenges the dancers at the afternoon auditions.

The new A-Troupe dancers are revealed, and Piper decides to form a club with her nervous fellow newbies; Riley is offered the opportunity of a lifetime, and Cierra and Amanda both vie for the final open spot on A-Troupe.

Riley assigns a trio competition to prepare for the first Regionals qualifier. Amanda and Michelle are threatened by Richelle.

West receives a mysterious package from London, England, which leads to a big surprise for the bros. Noah and Amanda collaborate on a song.

James prepares to leave for London.

Riley learns that Alfie is hiding a big secret, and his future at The Next Step is in jeopardy. James, West, and Eldon arrive in London, England for the Bangers & Mashups International Hip-Hop Extravaganza.

Noah's rehearsal prompts a discussion about which trio should be showcased to represent The Next Step. Meanwhile, Michelle wants Alfie to help her bolster her concentration skills on the dance floor; and Sloane gets pranked by Amy and Cassie.

As A-Troupe dances at the Qualifier, Amanda struggles to find the right time to share her feelings for Noah, while Noah continues to hide his back injury.

After the studio competes at the qualifier, Riley reconsiders her position as studio head. Noah and Amanda grow closer, but his back injury might get in the way.

Noah reveals how he feels about Amanda. LaTroy and Sloane get into a fight after he receives an invitation he can't refuse.

Michelle's competitive side is on full display when she's pitted against Piper to compete at the qualifier. LaTroy seeks out Amy's help to be the best dancer he can be.

Riley gets invited to an exclusive gala, and has to decide who to invite as her date. Skylar struggles to find her place on A-Troupe.

Amy makes LaTroy a proposition, but things get complicated when Sloane discovers new feelings; West and Eldon have an adventure in London.

Michelle and Riley have a lunch date and take a walk down memory lane; Noah, afraid of losing his spot on A-Troupe, continues to hide his back troubles.

Riley considers removing the team from competition because of a change in the qualifier rules. Meanwhile, the guys go on the hunt for Eldon's missing phone in London; and Sloane has trouble accepting Amy and LaTroy's relationship.

The guys compete in a hip-hop event in London. Elsewhere, Riley and Alfie's bond intensifies; and Noah's hidden injury begins to hurt the team.

Alfie considers Noah's health problems and surprises Riley with a plan for the qualifiers. Meanwhile, Amanda and Noah open up to one another; and LaTroy makes an unexpected decision in the wake of receiving news from his dad.

Auditions for the qualifier duet have added significance in the wake of Noah's diagnosis. Meanwhile, LaTroy plots to salvage Sloane and Amy's friendship; and Alfie opens up to Riley about his feelings for her.

Piper has trouble keeping a secret. Meanwhile, Amanda learns a secret skill from Henry; and an undesirable task is given to Amy and Sloane.

Piper gives Riley an ultimatum to tell James about her kiss with Alfie and Riley struggles to decide what to do.

Amanda's cousin Cooper shows up to visit the studio and notices the tension between Riley and Piper.

Riley tells James about the kiss. West and Eldon battle at the Bangers and MashUps competition in London. Noah and Amanda struggle with the next step in their relationship.

Riley asks James for some space to sort out her feelings for Alfie and Alfie misinterprets where Riley is at.

Emily shows up to help Riley get The Next Step to Regionals, but she has to make some hard choices to do it.

Emily and Riley choose a dance captain and deal with the qualifier duet.

Riley asks James for an impossible favour for the studio.

James and Alfie represent the Next Step at the final qualifier.

Riley makes a mistake with Alfie and tries to make it up to him.

Riley questions her relationship with Alfie.

Alfie asks Riley to go on a trip. She does, but not where he planned.

Jiley is reunited! But the team has lost a member.

The team prepares to leave for regionals. Cassie is made the alternate dancer but still tries to help the team.

The team competes in the first round at regionals but it is not what they expected.

The Next Step competes in the sudden death trio round. Michelle pushes herself before the trio dance in order to be ready.

With Sloane disqualified and Michelle injured, the team does not have enough dancers to dance in the final.

Now that Alfie is back, the team is able to compete in the Regionals final. But when Michelle shows up ready to dance, Riley has to make a heartbreaking decision.