The 16th Century. Playwright Kit Marlowe is attempting to write Doctor Faustus when a darkness descends on his life, in the cadaverous form of a Spaniard called Velez. The monstrosity is in search of a stone blade that was brought from South America...

After a near-disastrous collision with an asteroid in space, the TARDIS makes an emergency landing in Elizabethan England.

These two events are connected. The Omnim are ready. And the point of entry approaches...