Not "Least Plausible" (though that certainly helps) but the least accurate to how the players involved actually are. Relying on historical misconceptions etc. The most inaccurate ones i have read are "Live in Infamy" and "The Only Thing to Fear" by Caroline Tung Richmond
- Nazi Germany as a monarchy led by Hitler's Descendants
- America being conquered by Japan and Germany with the USSR still in existence and not attacked
- Americans are seen as untermensch
- The war is won with literal fucking superpowers including Summoning Ice, Summoning Fire, Destroying entire cities, Mind reading, and flight. Despite the germans getting these first they still decide not to attack the USSR!