Deus Ex Machina - S1.E10

Because of the fight between Bastian and Connor both are put on detention for a week. During the week, Miss Vinagan tells them to write a compostion on any subject so Bastian decides to write about the book but when bastian and Connor re-write the story, the events change in Fantasia to what they write.

In Fantasia, the 3 heroes lock up Atreyu and Tartis but they eventually get out and Atreyu battles Xayide's knights.