Keep your prized possessions safe from family, friends and alien life forms. Only you have the key! The TARDIS Transports the Doctor to any point in time and space. It is his protector on his travel as only the Doctor has the simple key that can open it. Without the key no man or alien can enter. When unlocked the TARDIS light flashes and the sound of the TARDIS re-generating can be heard. While locked the TARDIS light gently pulses.