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The fourth serial of the tenth season of Doctor Who sees the Doctor and Jo stranded on a planet that has danger seeping from its very pores. Spiradon is a planet inhabited by aliens known as Spiradons who have developed the ability to generate an anti-reflecting light wave which renders them invisible. As well as the Spiradons the planet also boosts a large population of venomous fungus and plants. Spiradon has been taken over by a troupe of Daleks who have subjugated the inhabitants in an attempt to perfect the art of invisibility.
The Doctor and Jo overcome the dangers of Spiradon with the
aid of a group of stranded Thals and the Doctor finds himself once again
standing in between the universe and his mortal enemy, the Daleks.
