The plot is good, considering the place, time and mythology creatures shown in the movie. The power of the 3 great Gods are based on Humans mainly their affection to the Gods and Goddesses. There are 3 classes in the world, God, Demi-god, and Human. Demi-gods are half-human and half-god.
"The film begins with a narration describing how the Olympians managed to overthrow their own creators, the Titans, through the aid of the Kraken, Hades's creation. After their fierce struggle, Zeus (Liam Neeson) became the King of the Gods, his brother, Poseidon (Danny Huston), the Lord of the Seas, and their brother, Hades (Ralph Fiennes), tricked by Zeus to rule the sickening Underworld in chaos and terror.