[[Category:th century| *]] [[Category:s| *]] [[Category:th century decades]] In 1661, a comet was discovered by the astronomer Clancy. It returned to Earth every one hundred fifty-seven years. (AUDIO: The Ghosts of N-Space) Erasmus Darkening was employed as an alchemist by Lord James Marchwood. He made Marchwood and his children vanish. (TV: The Eternity Trap)