Powell observes the opening lines of the "Odyssey" seem to echo the opening lines of the "Epic of Gilgamesh". The storyline of the "Odyssey" likewise bears many similarities to the "Epic of Gilgamesh". Both Gilgamesh and Odysseus encounter a woman who can turn men into animals: Ishtar (for Gilgamesh) and Circe (for Odysseus). In the "Odyssey", Odysseus blinds a giant Cyclops named Polyphemus, an incident which bears similarities to Gilgamesh's slaying of Humbaba in the "Epic of Gilgamesh". Both Gilgamesh and Odysseus visit the Underworld and both find themselves unhappy whilst living in an otherworldly paradise in the presence of an attractive woman: Siduri (for Gilgamesh) and Calypso (for Odysseus). Finally, both heroes have an opportunity for immortality but miss it (Gilgamesh when he loses the plant, and Odysseus when he leaves Calypso's island).