Garth Marenghi's Darkplace

The Creeping Moss from the Shores of Shuggoth (1x6)

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Dr Sanchez's life is in danger from a patient with a fairly bad cosmic broccoli infection. It's down to Dr Rick Dagless, MD to save his buddy - and the world. Or if all else fails, come up with a delicious way of using excess broccoli. It won't come to that, though.