Lily finds Rob's behaviour gross and decides to give him a dose of his own medicine.
Kingston must prove himself to keep his spot on Michelle's new troupe.
The Nektons' nemesis Alpheus Benthos breaks into the Aronnax to steal the Ephemychron.
Everyone at the castle accepts the inevitable but Noah has information that might help.
Lily tries to avoid turning out like her mum. Martha and Ollie pretend to be a couple.
Michelle, dissatisfied with Emily's dance studio philosophy, starts her own team.
The Nektons discover a mysterious ancient temple, hidden beneath the sea.
Mr Peabody has to come to the rescue when his son takes their time machine out for a spin.
The Next Step holds auditions, welcoming prospective new dancers to the studio.
Pirate boy Smiling Finn comes to the Nektons for help.
When Michelle shows up ready to dance, Riley has to make a heartbreaking decision.
Topsy and Tim love caring for their new pet rabbit, but struggle to agree on his name.
A giant creature is walking across the ocean floor, causing havoc.
James supports The Next Step in a way no-one would expect.
Mildred Hubble's world changes when she learns about selection day at Cackle's Academy.
The Nektons enter the Bermuda Triangle where the laws of physics don't seem to apply.
The Next Step competes in the sudden-death trio round.
Ant is determined to discover just what is swimming outside the Aronnax.
Vlad and Ingrid's mother Magda turns up at the castle.
The team competes in the first round at regionals but it is not what they expected.
The Nektons try to discover that the truth behind the Baltic Sea anomaly.
The team prepares to leave for regionals, and Cassie is made the alternate dancer.
The Nektons try to stop a fallen satellite's fuel from polluting a marine sanctuary.
Jiley is reunited! But the team has lost a member.
Hetty plans to rescue a kidnapped girl, leading to a final confrontation with her enemy.
Hetty searches the streets of London for Ida. Matron has her own plans to find her.
Alfie asks Riley to go on a trip. She does, but not where he planned.
Hetty starts her new life in a grand country house but is drawn into a world of mystery.
A mysterious bone is discovered in the community garden at Apple Tree House.
Riley questions her relationship with Alfie.
Hetty is shocked when she discovers that Matron has sinister plans for her future.
Riley makes a mistake with Alfie and tries to make it up to him.
Special visitors to the hospital are caught up in a fight among the boys.
Matt and Tabitha discover Ginger has been secretly filming her cousins.
James returns to London and Riley and Alfie have their first date.
Hetty's plan to help Nurse Winterson backfires when an innocent man is accused of theft.