The Loum were a species from another dimension. They were blue skinned, with one large red eye, razor sharp teeth, a very long tongue and three-fingered hands. They sought to embed a dimensional gateway in a t-shirt design that was sold in a London store. The effect of wearing the t-shirt was enough to enable a body swap with the humans in the other dimension providing a power source to maintain the Loum presence on Earth. When the Eleventh Doctor managed to open up the gateway and free the humans, the Loum were returned to their own dimension. (COMIC: T-Shirt Terror)