The Sarah Jane Adventures/Recap/S1/E03 E4 Eye of the Gorgon

A mysterious nun haunts the residents of the local nursing home. It soon turns out that an entire sisterhood serves under an old famous mythical beast...

Tropes

 * Ancient Astronauts: The Gorgons of Greek myth.
 * Light Is Not Good: Oh, so very much.
 * Continuity Nod: Clyde jokes that he'll never grow old because someday, he'll be able to transplant his brain into a robot. Sarah Jane responds with an exasperated sigh, likely thinking about the Cybermen.
 * Mythology Gag: There's only one person a Doctor Who fan will be thinking of when Luke says "I need a screwdriver."
 * Shout Out: A nun threatens to show how her boss will "solve a problem like Maria."
 * There is a mention of the 1964 movie The Gorgon starring Christopher Lee, Barbara Shelley, and Patrick Troughton.
 * When she finds the 'statue of Alan', Chrissie refers to Sarah Jane as a 'bunny boiler.'
 * Stalker Shrine: Chrissie mistakes her petrified husband for one of these when she sees him standing in Sarah Jane's living room.
 * Taken for Granite: With a story title like that, it's hard to think otherwise.
 * You Watch Too Much X: The nun's response when Clyde guesses she has tentacles under her habit. It turns out that the nuns are ordinary humans brainwashed into helping parasitic aliens.