The Saviour of Time The Doctor needs your help to locate the six segments of the Key To Time and save the entire Universe! Add the Doctor Who Bot to your contacts to start this interactive six-part adventure where you chat directly with The Doctor through Skype and help solve his incredible mission. Written by Joseph Lidster. This is an adventure from BBC Worldwide who help fund new BBC programmes. BBC is a trade mark of the British Broadcasting Corporation and is used under licence.