Venger's enslaved skeleton warrior, Dekion, reports that he has found the Circle of Power, but it is held in the Lost Tower of the Celestial Knights. Only those with the pure of heart and could be a celestial knight themselves could enter the tower and survive it's test of courage. Even though Dekion was once a celestial knight, because he is under Venger's power, he cannot enter. But Venger has a few tricks up his sleeve. Meanwhile, the kids are told to go to the Lost Tower of the Celestial Knights in order to find their new way of getting home. When they meet Dekion they are cautious, but when he informs them that he is a victom of an evil wizards spell they agree to help him. But once inside the tower, the kids start seeing illusions that test their courage, and they all start to fall victom to their fears.