The first time the fearsome Kraals attempted to take over the Earth, with the help of their android agents, things didn't go quite according to plan - thanks to the time-travelling alien Doctor and his allies at UNIT. This time Marshal Grinmal and his belligerent cohorts are ready for them.
This time they'll make no mistakes. This time Chief Scientist Tyngworg has not just one plan but a backup plan and a backup backup plan worked out....
With the Doctor a prisoner on the Kraals' radiation-blasted home planet of Oseidon, only his companion, Leela, can save the day - alongside a most unlikely ally.
NOTE: This adventure continues from Doctor Who - Trail of the White Worm.
Written by Alan Barnes and directed by Ken Bentley.
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