Once more, Earth comes under attack by aliens...
...and only Rex Dexter can save the planet from certain destruction!
(Do I sense a potential meme here?)
They haven't been there since they left to travel to Earth in Fox's Mystery Men Comics #1!
Rex and Cynde usually end up detouring back to Earth to save its' sorry butt...again and again!
Including this never-reprinted tale from Fox's Mystery Men Comics #16 (1940), over half of Rex's adventures consist of helping Earth...a planet, I might add, that booted him out!