Three Dirty Dwarves

Four children genetically engineered by the army grow up to be child geniuses instead of perfect soldiers, prompting General Briggs to use them to manufacture weaponry.

To escape, the children play their favorite role-playing game and lead the party - a trio of slow-witted but heroic dwarves - to a gateway into the real world. The dwarves' equipment burns up during atmospheric entry. They land in a sporting goods store and make use of the equipment inside for their weapons and armor. The monsters from the role-playing game world have followed the dwarves into the real world, and the dwarves must battle their way through them to find the children and confront General Briggs