Apparently, this city on Ganymede derives its power from Jupiter's magnetic field, but I'm not sure if "magnetic city" refers to its physical properties or is one of those unfortunate marketing phrases like "Cool Britannia."
Cat Women of the Moon... of Jupiter! If that doesn't sound like the makings of really good B-
I can't help feeling sorry for our spaceman, though. Here it is the first time he's had that helmet off since Venus and he's about to be ventilated by a load of rather hostile looking kitty-