Only the Screamin' Jaw Jumper playset was ever released. The Terror Mountain (aka Skull Hide Out) playset was ready for production, but never "got the green light". Below are preproduction sketches (by John Detrich) of playset ideas, and photographs (by Mike Groothuis) of the mock-ups and prototype models for Terror Mountain.

Screamin' Jaw Jumper (Jaw Tower)

Terror Mountain (Skull Hide Out)

"Nostril car shooter creature"