(Exciting Comics 006, 1940)
The Invincible Five (good name!) are a mysterious group of hooded men who have been kidnapping skilled mechanics across the US in order to construct a fleet of vehicles known as Submaplanes.
If you guessed that a Submaplane was either a submarine capable of flight or and airplane capable of operating underwater then give yourself a pat on the back because it is the former. Submaplanes also have some sort of electric forcefield, an electric ray cannon and appear to be remote controlled from a central location.
Having seemingly done away with John “Son of the Gods” Thesson, whom they view as their only credible opposition, the Invincible Five proceed with their master plan: world conquest through intimidation and mass destruction. Various governments are given the opportunity to surrender peacefully then given the business when they refuse.
(side note: these are some good hoods on the Invincible Five. The simple faces sketched on the front are a nice change from all of those regular-style hoods we usually see)
Unsurprisingly, the leader of the Invincible Five is Burton, the sour-faced industrialist who turns up to advise FDR to surrender. Presumably at least some of his companions are also in on the scheme.
It turns out that it was a good idea to try to kill John Thesson, because he ends up single-handedly taking down the entire operation by the simple expedient of punching people and things until the Submaplanes are grounded and the Invincible Five are in hand. Remember: if the only thing that stands between you and complete world domination is one person and you’re pretty sure that they’re dead: double check.