Thousands of years ago, aliens visited Earth and fathered the Pumaman, a man-god with supernatural powers entrusted by a gold mask with the ability to control people's minds, which in present-day London, falls upon the wrong hands.
During WWII, Captain Invincible fought against Nazis using superpowers. Later falsely accused of communism, he retires in Australia. When a secret US weapon gets stolen, he's called back but struggles with alcoholism.