"They came from a clear sky, without warning. Black parachutes floating serenely from a sky devoid of aircraft. It was the last serene day we’d ever experience. We were invaded, from another dimension, by Nazis! Invaders from a universe where the Nazis didn’t lose WWII. The Invasion of the Fourth Reich mini-setting / adventure provides the setup for a one-shot, short series or ongoing campaign in a world invaded by Nazis from another dimension. The setting is the Core World (the Earth you live in) with dimensional portals allowing travel to and from Erde – the Earth ruled by the German Fourth Reich." Now, I have never heard of Sixcess but they are making a Weird WWII supplement to their systems so be sure to check it out and see what its about.