Some time after the events of "The Precursor Legacy", Jak, Daxter, and Samos the Green Sage are invited by Keira, Samos's daughter and Jak's romantic interest, to help her test the artifact recovered from the Acheron Citadel at the end of the last game: the Rift Rider, which utilizes the Rift Gate. When activated, the Rider opens a portal that reveals a strange creature, and they get sucked in. The group is separated and Jak and Daxter land in Haven City, a dystopia ruled by the tyrannical Baron Praxis. The Krimzon Guard, a paramilitary force led by Praxis's right-hand man Errol, arrest Jak and chase Daxter away. For the next two years, Jak is subjected to a series of experiments that involve infusing his body with Dark Eco in Praxis's attempt to create a mutant soldier.