Song of the Unicorgi

Song Of The Crystal Unicorn is the 22nd episode of Season 15.

Summary
While playing her star violin in the Fantasy Forest, Cassie's music lures in a Crystal Unicorn and they become quick friends. But when Gaston the hunter hunts down Lumina and steals the star violin to use it for his own evil deeds, Cassie and her friends must get is back and rescue her new friend.