The are the leaders of the thirteen squads. Each controls a specific squad with the exception of the , who acts as both captain of Squad One and leader of the Gotei Thirteen; the implication is that this is an ex officio position. All captains are able to perform the "bankai" of their "zanpakutō". To achieve the position of captain, a Soul Reaper must display great expertise with Soul Reaper abilities and battle tactics, and must be approved by either their fellow captains or the members of their own squad. There are three ways a Soul Reaper can become a captain.