Use the air conditioning!
Some wag must have put a classified ad into the Intergalactic Times, offering up one planet, sold as-is, slightly used and with annoying inhabitants who need to be exterminated, because Earth gets invaded quite often during Patrick Troughton’s tenure on Doctor Who. Season Six alone features three stories using the invasion of Earth as a plot device: “The Mind Robber,” “The Invasion,” and Brian Hayles’ sophomore effort with his Ice Warriors, “The Seeds of Death” (Story Production Code XX). To his credit, Brian Hayles creates, again, an interesting take on human culture and civilization, but he falls prey to the continued flattening of Doctor Who monster motives.

In our first encounter with the reptilian Martians, their leader, Varga, wants to get his ship, and his crew, back to Mars after centuries buried under a glacier. Though ruthless, Varga shows at least suggestions of character and cunning, with some hint of honor and duty in his otherwise sibilant menace. The leader of the Ice Warriors in “The Seeds of Death,” Slaar, comes across as nothing more than petulant and impulsive, killing a human key to his scheme and then throwing a hissy (sorry!) fit when, as is inevitable, the Doctor outwits his invasion plans.
Still, for a while, Slaar’s plans work quite well, as they hinge upon an isolated base (on the moon, of course) that contains the technological linchpin required for continued human survival. Rather than the Gravitron that the Cybermen sought as a prelude to invasion in “The Moonbase,” here the wonder technology is the Travelmat Relay, or T-Mat, for short. Using the moon as a relay station, T-Mat allows for near instant dematerialization and rematerialization between any two T-Mat cubicles on Earth. This transit technology has supplanted all other forms of travel, including space flight and ground vehicles, such that there’s (almost) no way to send help to the moon. With the lunar T-Mat relay knocked out of operation, human society begins to collapse, as all foodstuffs and medical supplies move via T-Mat. Eventually, a weakened Earth would be ripe for invasion.
But that’s not the plan. Instead, the Ice Warriors intend to send foam-filled fungal seeds to a few cold cities in the hopes that the foolish humans will open the T-Mat cubicles out of curiosity and let the fungal spores escape. Sadly, that actually works, too…
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