The wicked Florina and her assistants, Paradoxie and Tonzeror, are joined together under the direction of their mysterious leader, Skulduggerstein, on a search for the Skull Stone. This stone is fabled to reveal the whereabouts of a fabulous vein of gold buried somewhere deep within the Earth. Skulduggerstein sends Florina information concerning location of the Skull Stone, then she and her accomplices follow these leads on their search. But... the information is almost always unreliable, and the trio always ends up getting into trouble. The Yattermen pursue them, and rush to prevent the Skull Stone from falling into the hands of Florina's gang. The two groups battle for possession of stone as Florina's gang create a new robot or mechanism (mecha) every program to carry on the fight. Unfortunately for them, the Yattermen and their robots, or mechas, always succeed in destroying whatever robots the gang come up with.

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