Swumpy sneaks into school, and Pickle accidentally makes him super clever so that she comes top in her test! This backfires when she has to represent the school in a maths competition.

When Pickle gets stressed about her birthday party, she unintentionally opens the magical portal to Kleftania, bringing evil Lord Clunkett to Earth and seeking revenge.

There's a brand new slide at school, and Pickle really wants to try it out. However, things get complicated when Pickle's mood magic causes Mia and Mr Ludcomb's hair to grow uncontrollably.