Kor is the main antagonist of Jak II, and the leader of the Metal Head race. During Jak II he served as the opposing factor of Baron Praxis, and, while in disguise as an elderly human, an inside-man working for the Underground resistance movement, charged with watching over the Kid (young Jak, the heir to the throne of Haven City). He worked for the Underground in order to both sabotage the Baron's deal with him, and also get close to both Jak, set to destroy him, and the Kid, the only one pure enough to activate the Precursor Stone.