"Creatures of Green Slime" by James Rosenquest is about the first manned expedition to Mars, in which an encounter with an alien life form results in takeover by green slime. It's an attempt to create horror in the reader with the use of italics, exclamation points, and strong men weeping. Doesn't work. What stopped me in my tracks, though was the fact that they check out the green slime by testing it on a bowl of goldfish. Yes, that's right. They took a bowl of goldfish on the first manned expedition to Mars. I wouldn't have thought to take it, but by golly someone did.
"Terror of the Undead Corpses" by Rusell Thompson is about the first manned expedition to Venus, in which contact with an alien life form results in corpses reanimated by green slime. No, wait, that's the other story. Well, yes, but it's this one, too. The difference is in the way the takeover works. Not that you'll care much.
Obviously the publishers were trying to capitalize on the monster craze in the movies of the time, but it didn't save the magazine. I'm sure Todd Mason could give you the entire crazed history of it, and he might even know if Rosenquest and Thompson were real people or just pen-names for Ellison and Silverberg, who apparently wrote most of the stories for this publication.
Great Freas cover, though, and fine Emsh interiors. More reports later.