Grenadier released five large boxed sets three of which came with many useful monsters and two of which came with all to many human types. At the time, getting a box of 20 varied player character was a nice thing. To a collector years later, who is swamped with player characters and short on interesting monsters, more large monster boxes would have been nice... Four of the large box sets (all but the dragon) were carryovers from their Wizzards & Warriors line.
(Full sized, better quality scans of box inserts are available in the Catalogs directory.)
In the earlier Wizzards and Warriors version of this set two different Balrogs were used. One with a highly breakable sword and another smaller one.
Three Versions of this set were released with just a few differences in the miniatures.
The second version, which is also very rare replaced the umber hulk with a cockatrice and the minotaur with a shrieker.
Grenadier produced only three Dragons for their AD&D line, this grand diorama, the baby dragon from their Tomb of Spells set and the Prowling Dragon from their Fantasy Fiends Action Arts set. After quitting the AD&D line, they went on to produce an exception line of dragons, which were no doubt originally planned for their AD&D line.