Order of St. Agnes

The Order of St. Agnes were a Sisterhood of nuns under the command of the Gorgon, who had transformed the once peaceful nunnery into a mind-controlled cult for over two hundred years - with each generation being a fanatical servant to the Gorgon's will, caring for the ageing Abbess with which the alien infiltrated their society and corrupted their faith.

The Order would be tasked by the Gorgon with retrieving a talisman by which to open a portal to the Gorgon home-world and allow the aliens to invade Earth and presumably wipe out the human race (after possessing and draining them of all energy) - this would lead them into direct conflict with Sarah Jane and her family.