Supermann #12/1966

In "Den forbløffende havfrue," Lois Lane experiments with a mysterious formula that grants her the ability to breathe underwater—only to discover it’s a dangerous dependency that demands she be submerged in fluid every hour or face fatal consequences. With Supermann and Jimmy Olsen caught in the mystery, and Dr. Mason’s role growing increasingly enigmatic, the line between scientific breakthrough and deadly trap begins to blur.