Alifabe

The Alifabe was a giant, worm-like creature that lived in the matter-lining of hyperspace. One became ill and fell to Earth, landing in Manchester in 2011. Its empathic nodule on the top of its head was bruised and badly damaged so the creature had crawled to the highest point it could find (a tower block). The creature became a target for a military air-strike but the Doctor and Amy Pond were able to use the satellite dishes on the side of the building to boost an interspatial signal enabling the creature to return home safely and the air-strike was aborted in time. (DWAM: Sky Scraper)