The Green Peril
Storyline: Dr. Cosgrove's assistant plants a tendril of the vicious Green Peril plant near the site of von Emmelman's wrecked airplane, and soon it begins to take over the forested area. The Heap, sensing the struggle occuring between the plant and the Wassau Swamp, heads for the area, and battles the plant in efforts to save the life of Cosgrove.