Middle Mouse

Middle Mouse was an island off the coast of Anglesey. It was located between East Mouse and West Mouse.

UNIT established an observation base on the island when they believed that the Sea Devils had returned. In the 2010s, it was used as a place to hide the Arch whilst Petronella Osgood performed her experiments. The Eleven eventually located it and arrived on the island, but he failed to acquire it and fled. (AUDIO: Eleven's Eleven)