Batman fights a villain with the power to turn his body into any element in this Bill Finger/Sheldon Moldoff tale.
Professor Higgin’s lab assistant, John Dolan, gets accidentally exposed to a gas that endows him with his element changing powers, and he starts to go insane. Higgins builds him a belt that will control his changes.
The professor works on trying to find a cure while Batman tries, and fails, to capture Dolan.
Batman gets exposed to the gas, and also transforms into a element man. Fearing he will go evil, Robin and Higgins lock him up, but he escapes as mercury and joins Dolan in his rampage.
The explanation for how Batman rigs the machine to drain Dolan’s powers is overly complex, it goes on for two pages.
Although this character never returned, he was one of the four villains to have new versions made of them as Strikeforce Kobra. As well, his powers are essentially the same as those of Metamorpho, who would be introduced a few years down the road.
Aquaman, Aqualad and Topo all return for this Nick Cardy story, in which a man claims to have trained bizarre sea creatures to respond only to him.
It takes Aquaman only a couple of pages to figure out the creatures are robots, and defeat the liar.