The Ice Warriors' seed pods beginning materialising all over the globe while Slaar decides to kill the Doctor by T-matting him into space.
Did You Know?
In the original script, the Martian spores were only intended to erupt after four weeks rather than almost instantaneously, and were initially destroyed by concentrated oxygen (possibly in a liquid form) instead of water. See more
Brent is still visibly breathing when he's taken off for autopsy. See more
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