According to Jess Nevins' Encyclopedia of Golden Age Superheroes, "he fights a variety of Axis agents, human and superhuman, from the Black Legion to the shrink-ray-wielding Professor Nakajima.

[6] In The Spectre, Uncle Sam is reimagined as a spirit created by the Founding Fathers who is bound to a talisman and assumes a physical form by possessing others.

[7][8] In Infinite Crisis, Uncle Sam and the Freedom Fighters are ambushed by the Secret Society of Super Villains where he is seemingly killed by Sinestro.

[9][10][11][12] Uncle Sam has demonstrated various powers, including super strength, invulnerability, the ability to alter his size, enhanced speed, and some degree of clairvoyance.

[15] Based on comments by Grant Morrison and the fact that a Nazi version of Superman is depicted in the scene, this alternate universe is not the pre-Crisis Earth-X.