The Manglor Mountain Volcanic Fortress Playset

[stonewar]

I think there was a commercial for the volcanic mountain playset. As soon as I saw the box in your first image. I remembered the Manglord (and other mang-things, cuz the commerical showed you could put the other guys in it) rising out of the bloody red (as it appeared on tv) slime.
I love slime. Dad would come home from the hardware store with those little trash cans of slime with the eyeballs in them sometimes. fond memories.