The lion tracks down an old plane that can be revived using items left by his great-father, a heroic pilot. The name of this plane is Hürkuş. This old plane becomes a magnificent plane with the help of Aslan. Master Hasan gives the remaining items from his father, a heroic pilot, to Aslan. The Lion, who is obsessed with being an aircraft engineer, comes across notes that his grandfather's old plane can come to life as he goes in and out of these items. Thanks to these notes, Aslan and his friends track down the missing arm and Hürkuş. But they are not the only ones who are after the arm.