This day in 1953, Robot Monster was released
This day in 1953, Robot Monster was released

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Robot Monster - Wikipedia

As featured in experiment 107, also known as "The One With the Gorilla in a Space Helmet." Available for free on Shout Factory's official MST3K YouTube channel.
There are lots of un-riffed versions available as well, but without the jokes it's a pretty rough watch, in my opinion.
The Rifftrax boys also did this one, it's billion-bubble-tastic!