Medtronic v. Lohr Has Two Shadows

For over fifty years, the BBC has been chronicling the exploits of that ultimate learned intermediary, Dr. Who. Over the decades, successive Doctors have crossed swords (or sonic screwdrivers) with a wide variety of enemies, from the Master, through Daleks, Cybermen, Zygons, and Mara. But for us, there is no more terrifying foe than the Vashta Nerada. In the episodes "Silence in the Library" and "Forest of the Dead," these microscopic piranha of the air lurk in the shadows until swarming around their next victim, whom they reduce to skeletal leftovers in seconds. Shortly before the end, those selected for consumption by the Vashta Nerada take on an unusual characteristic – they have two shadows.