The school's talent show is coming up, and Mia is all set to reveal her hidden skill to the world: tap dancing. But thanks to a jealous Violetta, her tap shoes go missing moments before the performance. Burdened with worry, Mia jumps to Centopia to find that Onchao is getting ready for a show of his own: a special unicorn ceremony inside a volcano, presided over by the fearsome Fire Unicorn. But when Yuko and Mo are captured by muncs, Mia has to intrude on the ceremony to get Onchao's help.