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File:Ice leader 4766.jpg

The TARDIS lands on 21st century Earth, and discovers that the T-Mat matter transportation system upon which the entire planet's economy now relies, is broken. The Doctor and companions agree to take an elderly rocket to the Moon (which houses the relay station) and investigate.

When they arrive, they discover that Ice Warriors have taken over the station and are preparing to invade Earth. They have seed pods which will be T-Matted to selected points on the Earth's surface before emitting fungus that will remove oxygen from the atmosphere, killing all humans and rendering the planet habitable for the Ice Warriors.

The Doctor manages to get the T-Mat working and transports back to Earth, where he discovers that the seed pods are destroyed by contact with water (quite a big hole in the Ice Warriors' plan there). He uses the weather station on Earth to trigger a downpour, destroying all the seeds, then T-Mats back up to the moon to misdirect the approaching Martian fleet into orbiting the Sun, where they will be destroyed.

Not to be confused with The Seeds of Doom

Watch it here.


 Doctor: We sent up a satellite. That signal has sent your fleet into a false orbit.

Slaar: The heat of the sun will kill them! You have destroyed our entire fleet!

Doctor: You tried to destroy an entire world.

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