After defeating the Kraken in Clash Of The Titans, Perseus is living a quiet life with his son. But a war breaks out between the gods and the Titans, and Perseus' father is captured. Perseus must now save the world from annihilation, by saving Zeus from Kronos.
What probably works in Wrath Of The Titans' favor is that being a sequel, it is only expected to pick up from where the first left. And thus having approached it with its predecessor in the head, it is quite easy to say it's a slightly better sequel, but with nothing drastically different.
After defeating the Kraken, Perseus (Sam Worthington) manages to live a quiet life as a fisherman, along with his son, Helius. But he's pulled out of his paradise by a war between the gods and the Titans, that threatens to wipe out the world.