While exploring some ancient ruins on a forbidden island off the coast, Jak’s best friend, Daxter, is knocked into a vat of Dark Eco–a terrifying and deadly substance that could corrupt the world forever — transforming him into a weasel-like rodent. The village sage, Samos Hagai, tells Jak that there’s only one person who holds the secrets to transforming Daxter back. Now the pair must set out on a quest in search of a wise old sage who has the power to restore Daxter to his former self.

 

The game follows protagonist Jak as he tries to help his friend Daxter after he is transformed into an ottsel, a fictional hybrid of an otter and a weasel. With the help of Samos the Sage, the pair learn that they must save their world from Gol and Maia Acheron, who plan to flood it with dark eco. The game offers a large range of missions and minigames as well as puzzles and platform elements that the player must complete to proceed.