The canyon of giants

Blinded by heavy mist, a misstep causes Erro to plunge into a deep canyon where he is caught by one of the giants who is imprisoned there while Zak is plucked off the cliff ledge by a different giant--but the giants are not friendly, and while they are discussing whether to give the boys to the Alcatraz guards or turn them into lunch, Zak comes up with a way to escape either fate.