Hawkman is in the stone age era, whom the natives consider to be a large bird, enough for several meals. Hawk overcomes their attack and of a bear, and is hailed as the new leader of a tribe. He is shown a cave painting of a wooly mammoth, who members of the tribe believe not to be a painting, but a real animal, and they intend to kill the artist. Hawkman, now known as "Ga," prevents this. The artist tells him these animals indeed exist and helps Ga protect the tribe from a herd of the beasts. He is then accepted as one of their own as Hawkman disappears into the mists of time.; Johnny finds himself in medieval England, a lowly shepherd boy, and is brutally flogged for accidently hurting a soldier. He wants to go before the Baron and tell him that the Serfs are men, not be robbed and left to die, but, instead, makes the Baron laugh and he becomes court jester. The Baron is so impressed that, if Johnny enters the Knight's Tourney and wins, then he'll consider doing something good for the Serfs. With the help of the Thunderbolt, Johnny wins and is knighted by the Baron....but disappears just as the Baron's (ugly) daughter is brought before Johnny as his bride-to-be.; Starman is in ancient Greece in 480 B.C. where he is a Greek soldier and member of the Strategoi. He recommends the training of their slaves in warfare, making the Greek Army second to none. But the Generals think the slaves are cowards and the plan foolish. Starman begins to train the slaves, until that day when they are first taken into battle. Accidently discovering the power of the gravity rod, Starman uses it to push the foe back. The slaves win their freedom and word goes out to train their other slaves to fight and earn their freedom as well.....all just as Starman fades from view.; Atom is in old Salem in Colonial America, where witch hunts and trials occured. At home hears of a "witch" living in the forest, and he later finds her trapped by a tree and saves her. Her knowledge of medicinal herbs brands her a witch. Later, using his disguise as the Atom, he tackles a mob and tries to convince them that she isn't. Instead, they believe him to be a wizard and flee. Then Mother Rathlow comes by and thanks him for understanding, and that she is going to live with relatives in Virginia. Just then, Atom begins to vanish, making Mother Rathlow to think he actually is a wizard!; Dr. Mid-Nite is in Paris in 1793 during the French Revolution, embroiled in the deep-rooted mistrust and hatred of a royal family that has does much harm to the common people. As a city doctor named M'sieu De Nider, he is told about a seriously injured nobelman, and heads out to help, being branded a traitor by the common people, but is also fearful that the people have let their new freedom go to their heads. Re-disguising himself as Dr. Mid-Nite, he travels out into the night to keep the people from trying to kill all noblemen and succeeds only at the last moment.; The Spectre, in the year 1815, meets Stephen Hare, who has invented a tiny motor powered by electricity, which is not well received by the townspeople who want to smash the invention. The Spectre intervenes, and afterwards, convinces Hare to continue with his inventing, that someday people will accept such things rationally. But Spectre's work is not finished, as other inventors are headed for the same treatment. Heading such an attack off, the Ghostly Guardian introduces a young inventor named Robert J. Fulton, who just invented a contraption called the steamboat, to Hare.; After witnessing an attack on a boy because of his religious beliefs, Dr. Mid-Nite takes the young victim to the JSA, and lets the boy tell his story. But the members aren't sure how they can help until suddenly a strange female being appears and tells them they can IF they are willing to undergo a test, which they agree to do. Each member will be hurled back in time to eras of great persecution and prejudice [without their present knowledge] to become opponents of those prejudices and hatreds. If they let the difficulties of the past overcome them, they will fail their missions.; The JSA members return to their HQ after having all succeed in their individual assignments. Conscience now identifies herself to the members as the Conscience of Man and tells them that by educating people, their understanding will then overcome their hatreds, fears and prejudices. Conscience then disappears, but the young lad whose dilemma started the whole matter, suggests that the JSA visit his school and start a program of education there. They do, with resounding success!