Bat

Origin
The Bat was created by Eden Phillpots, under his pseudonym of "Harrington Hext," and appeared in Number 87 (1922).

The Bat is Paul Strossmeyer, a Yugoslav trade representative who grows concerned with the short-sightedness of various world politicians, especially with regards to the discovery and application of atomic energy. So Strossmeyer begins a series of terrorist acts, from the disintegration of the Albert Memorial to the destruction of various Christian Science churches to the assassination of several politicians, from Britain, Japan, America, and Russia. In each case the assassination was done by a needle-thin puncture near the heart and the transmutation of various elements of the body. Also in each case, a mysterious figure was seen near the crime; this figure, the Bat, is larger than a man, has glowing eyes, and leaves behind a foul stench.

Strossmeyer is the Bat, who worked with radioactivity for decades and discovered Element 87, which allows for the easy splitting of the atom and the production of enormous amounts of energy. Strossmeyer used Element 87 to power his flying suit, his weapons, and his bat-shaped aircraft, which can fly through the upper atmosphere at 100,000 miles an hour.

It all ends badly for Strossmeyer, of course, who destroys his fortress and then heads off into space to kill himself.