Alien (Rory's Story)

From Tardis Wiki, the free Doctor Who reference

This alien was once causing havoc inside a ‘Price Cutters’ store on the high street. The reputation of the Doctor was known to it. The creature mistakenly believed Rory Williams, who was shopping for milk, to be the Doctor. The creature, fearful for its life, willingly agreed to leave the planet and go home when given the chance. (DWA: Rory's Story)