ADVENTURE COMICS #409 (DC, 1971)

"Invasion of the Mer-Men!" Dig the purple strides!

Art: Dick Giordano

Was intrigued who SATAN-GIRL might be, but a little bit of research told me this was a Legion of Super-Heroes story reprinted from Adventure #313 (1963) that sounds like a great tale involving the Crimson Virus, Red Kryptonite, the Legion of Super-Pets and... well, I'm now gonna have to hunt this story down - it sounds a peach!