In the 2005 BBC revival opener 'Rose', the newly regenerated Ninth Doctor, played by Christopher Eccleston, grabs Rose Tyler's hand as shop mannequins come alive and shouts his first great command: run. The line summed up his whole era, a Doctor who faced impossible odds with leather-jacket bravado and a single urgent instruction. Fans quoted it endlessly, cosplayers put it on signs, and editors lifted the half-second shout for reaction videos. Two decades later it still works as the quickest possible way to say trouble has arrived.