Invaders from the Deep poster
Invaders from the Deep poster - Source
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MST3K Ep. K01 - "Invaders from the Deep"

This is the first episode of Mystery Science Theater 3000 ever aired. No fan copy is known to exist.

Movie Summary:

Movie version of Gerry & Sylvia Anderson's Supermarionation puppet series Stingray, about the eponymous super-submarine operated by the World Aquanaut Security Patrol (WASPs), fighting aquatic creatures who attempt to take over the planet.