why did zeus turned io into a cow
Io (mythology) Io was a priestess of the Goddess Hera in Argos,[5][16] whose cult her father Inachus was supposed to have introduced to Argos.[5] Zeus noticed Io, a mortal woman, and lusted after her. In the version of the myth told in Prometheus Bound she initially rejected Zeus' advances, until her father threw her out of his house on the advice of oracles.[17] According to some stories, Zeus then turned Io into a heifer in order to hide her from his wife;[5] others maintain that Hera herself transformed Io.[17][18]
Wrath of the Titans Perseus (Sam Worthington), a son of Zeus (Liam Neeson), lives as a fisherman after the death of his wife, Io (portrayed by Gemma Arterton in the previous film), with his young son, Helius (John Bell). Zeus visits Perseus and asks for his help, saying that humans are not praying to the gods and as a result the gods are losing their power and becoming mortal. They can no longer sustain the walls of Tartarus which are crumbling, and the imprisoned Titan Kronos will soon be free. Perseus, valuing his family's safety, refuses to get involved.