The worst monster in movie history?
Quite probably (unless you know better).
The monster in "Robot Monster" (1953) had a gorilla-like body, and a diving helmet with two TV antennas. The movie poster added the "face" of a human skeleton. The poster also informs us that the monster came from the moon.
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@fitheach Frank Zappa on Roxy&Elsewhere talks about the movie, It Conquered the World, with a monster he describes as "an inverted ice cream cone with teeth around the bottom". He describes that as the monster comes out of the cave you can see a piece of 2x4 attached to it, and an off stage voice saying, "No! Get it back!". The song is called, Cheepnis.
Of course, after hearing it I had to verify what FZ said, and sure enough he wasn't lying.
@lwriemen
You might have the winner.