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"Attack of the Cybermen," Doctor Who's 22nd-season opener, began its two-episode run on January 5, 1985. Having already captured a time vessel, the dreaded Cybermen also snatch the TARDIS. This action prevents the Doctor (Colin Baker) and his new allies, the alien Cryons, from thwarting the Cybermen's plans to harness the power of Halley's Comet to destroy the Earth. Once again, the sewers of London are turned into a battleground as the Doctor tries to square off against his perennial enemies. Written by Paula Woolsey, "Attack of the Cybermen" was originally telecast in two 45-minute installments; for American consumption, the adventure was re-edited as a four-part cliffhanger.