The summary is: 1) Odysseus and his crew stumbled upon the land of the Cyclopes and ventured into the cave home of the cyclops Polyphemus. 2) Polyphemus captured and devoured several of Odysseus' men when he found them in his cave. 3) When Polyphemus returned to his cave, he was angry to find Odysseus and his men there and refused to welcome them as guests, leading to a conflict between Odysseus and the cyclops.