Ratchet: Deadlocked is a 2005 third-person shooter platform video game developed by Insomniac Games and published by Sony Computer Entertainment for the PlayStation 2. It is the fourth installment of the Ratchet & Clank series. The game's story begins as Ratchet, Clank, and Al are abducted and forced to compete in "DreadZone", a violent game show in which heroes are forced to kill each other. Ratchet is given a "DeadLock" collar, which will explode if he becomes uncooperative or boring. The three must find a way to deactivate the collars and free the other heroes being held prisoner.