DC Multiverse - Man-Bat (DC Rebirth)

This genius-level zoologist attempted to make a serum derived from bats, in order to give humans special "sonar" senses. But the formula backfired, mutating Langstrom into a giant "Man-Bat," complete with its own feral personality. Batman routinely tangles with this creature of the night, hoping to save Langstrom from his own scientific sins!