This was the legendary "4th Release" that was planned but never happened. Ral Partha made the figures, but the relationship between Partha and Steve Jackson was beginning to fall apart.
Only a few master castings were ever produced, and the molds were destroyed. The Ogre Mark IV prototypes were sculpted by Jeff Wilhelm.
Ogre Mark IV
"Rebel Yell"
Ogre Mark IV
"Winston's Revenge"