In the final act of the movie, Perseus (played by Sam Worthington) embarks on a dangerous journey into the Underworld to rescue his father Zeus (played by Liam Neeson), who has been captured by his treacherous brother Hades (played by Ralph Fiennes) and Zeus’ son Ares (played by Édgar Ramírez). The trio plans to use Zeus’s divine essence to release the monstrous titan Kronos and bring about the destruction of humanity.
Perseus is joined by Queen Andromeda (played by Rosamund Pike), the demigod Agenor (played by Toby Kebbell), and the fallen god Hephaestus (played by Bill Nighy). Together, they navigate through treacherous terrain and face various mythological creatures to reach the Underworld.
As they confront Hades and Ares, Perseus discovers that Zeus willingly sacrificed himself to save his son. The group manages to defeat Ares, and Perseus engages in a fierce battle with Hades. With the help of his newfound allies and the legendary weapon known as the Spear of Triam, Perseus eventually triumphs over Hades.
However, the true threat lies in the awakening of Kronos. In a climactic showdown, Perseus confronts the colossal titan and ultimately defeats him by using the Spear of Triam to send him back into the depths of Tartarus. This act also restores balance between the gods and humanity.
The movie ends with Perseus mourning the loss of his father, but there is a glimmer of hope as Zeus’ spirit is seen watching over his son from the heavens. The surviving characters return to the surface, and the gods, now humbled by the events, decide to rebuild their relationship with humanity.
This concluding sequence wraps up the main plot points and brings resolution to the central conflict, highlighting themes of sacrifice, family, and the enduring struggle between gods and mortals.