Blackhawk challenges Nazi Ace Hans Oberst to an aerial duel to the death, which he accepts, but Blackhawk is unaware that it is a trap. However, a newcomer to Blackhawk Island, Tondeleyo, sows seeds of discontent and cowardice among the Blackhawks, and Chop-Chop is the only one to pull his friends out of their depression and take on the Nazis.; The Sniper locates a mad scientist in the Black Forest who has the capability of turning troops into microscopic size, then putting them into the body of a suicide bomber pilot heading for England. When the reverse serum is applied, these men would burst forth from the pilot's corpse. The Sniper, who was also a pilot, shot down the bomber and Holtz committed suicide.; The President of the United States personally enlists the Blue Tracer for a mission in the mountains of Yugoslavia, where the machine demonstrates its most powerful feat to date (and taxed it accordingly) by plunging from the sky and burrowing a tunnel straight through a mountain.