When the malevolent mastermind known as Iron Hand enslaved Earth-Two with a gigantic energized hand, itself a replica of a long vanquished alien entity known as Nebula Man, it then became necessary for the greatest heroes of two worlds to retrieve from the lost pages of time Seven Soldiers of Victory... who had themselves the key to destroy the nebula hand as they had man it was modeled from decades earlier.
And so, the Oracle sent members of the Justice Society and Justice League to seven historic eras to bring back to the 20th century the seven surviving members of the Law's Legionnaires. This tale in some way parallels a later team up of the League and Society in assisting the Legion of Super-Heroes versus their arch-enemy and Oracle's Earth-One doppleganger, Mordru.
Similarly, when Doctor Fate, Atom and Elongated Man first battled a nebula empowered Crimson Avenger, this mirrored when Atom and Hawkman faced off against a Mayan warlord.
When Superman along with Sandman and Metamorpho rescued a mind manipulated Shining Knight while fighting Genghis Khan, this paralleled a time when Superman met a young Khan.
Then there was the occasion in mideaval England when Doctor Mid-Nite, Wonder Woman and Hawkman located a time-displaced Green Arrow of Earth-Two, while the Green Arrow of Earth-One along with his world's Batman went to the same era to face the evil winged Gargoyle during his twisted scheme.
The Outsiders' Batman, Geo-Force, Katana and Black Lightning journeyed to ancient Egypt as had the same Batman along with Starman and Hourman... each time trying to rescue Metamopho and Stripesy, respectively.
An evil Lord of Time sent Justice Leaguers Flash, Green Lantern, Zatanna and Elongated Man to the old west of America, while Oracle did the same for Green Arrow, Black Canary, Johnny Thunder and his Thunderbolt, but for very different reasons.
Kid Flash and Mal Duncan had been sent to prehistoric times by a device created by their mentor Mister Jupiter, wherein they encountered a behemoth brute later known as Gnaark whom Mal fought. Something similar happened with the Gnaark of Earth-Two who faced Wildcat along with his allies Aquaman and Green Lantern... as they were locating Star-Spangled Kid.
Finally, the Earth-One Circe had transformed an archer named Biron into the winged horse known as Comet... while the Earth-Two Circe had done the something similar with Speedy the archer... although he didn't have wings like his teammate Shining Knight's flying steed, Winged Victory.