The Advanced version of the Milton Bradley game. It was clearly supposed to get as many expansions as the original game.
The box contained the Adventurers shown below, plus a handful of henchmen and and a hoard of Skaven. All the pieces in the box were plastic, but the painted version son the box rear used metal pieces as the plastics weren't ready yet. Several of the metal prototypes escaped the Studio and show up on the collector's market.
GW released a metal version of the wizard as a free give-away with a UK issue of White Dwarf.