During a break from the latest round of experimentation, Daxter finds Jak and breaks him out of the facility. Initially unbeknownst to Praxis and Errol, this last experiment is a success, giving Jak the ability to transform into a mutated version of himself with increased strength, reflexes, stamina and aggression. Jak and Daxter join the Underground, a resistance movement that seeks to replace Praxis with the rightful heir of Haven City, known as the Kid. The Underground is led by a mysterious figure known as the Shadow; his lieutenant Torn refuses to let Jak speak to him. Torn explains that Praxis is at war with the Metal Heads, an evil race of biomechanical creatures that date back to Precursor times. Jak and Daxter later reunite with Keira and Samos, and discover that the Shadow is in fact a younger version of Samos. While exploring the city ruins, Jak and Daxter come across the remains of Samos's hut and realize that they have been flung nearly 500 years into the future, with Haven City built over the remains of Sandover Village.