Thunder Over LondonBatman, Green Lantern, Flash, Hawkman, Superman and Wonder Woman) watching a newsreel about a new "Super-Nazi" causing havoc over London...and even besting London's protector, the Shining Knight!
Lightning In Berlin
Marvel Family fell out of Hitler's influence...by flying Billy, Mary and Freddy out of Hitler's Spear of Destiny control). The evil plan defeated, Billy guesses that if the three Marvels and their alter egos all say their magic words, they'd go home and be restored to normal....which they do (and readers guess they did!), as the JSAers and Plastic Man head home.
JSA was sent into hyperspace by Harbinger), and much later, after the Earths start to get designations (starting with the first JLA/JSA crossover), the Earth-1 Superman and Earth-S Captain Marvel meet as well. This caps a little review, and a rare Earth to Earth crossover that did not involve Earth-1, but Earth-2 and Earth-S!