Tempestuous Temporal Tyrants Twisting Time

In the year 7532, two technologically savy men nearly jeopardized the safety of their respective Earths, leading to influencal impacts into the lives of two costumed crusaders from the 20th century. The misguided males of the 76th century were Anti-Lad of Earth-One and Black Barax of Earth-Two. And the colorful crusaders were Superboy and Mister Terrific.

Anti-Lad was originally a student doing biographical research on Superboy, and particularly his history with the Legion of Super-Heroes. However, the lad witnessed via his time scanned that the Boy of Steel failed in his initation test with the team, resulting in the Legionnaires rejecting his membership. Realizing that this was due to adverse radiation emitted from the scanner warping the past, the lad and his father realized this would change the course of history. While the father attempted to appeal for help with the science court, his son assumed the identity of Anti-Lad and wearing specialized glasses traveled back to the 30th century. There, Anti-Lad presented himself for membership, and after defeating individual members of the Legion, was granted membership. Then, with comments he made and evidence he planted, Anti-Lad led the Legionnaire Brainiac Five to suspect that his new teammate had sabotaged Superboy's test with the Legion. When Anti-Lad confirmed this, they revoked his membership and approved Superboy as a new member. Returning to 7353, Anti-Lad was content that history was restored once more.

Black Barax was an invading tyrant to Earth-Two who used his resources to kidnap the  Coordinator, a scientist who developed the means of preventing Earth-Two's destruction from the gravitational forces of a planetary body that entered the world's orbit recently. Seeking a means to save their scientist and their planet, the science court used time travel device to retrieve Mister Terrific from the 20th century to their era. The "Man of a Thousand Talents" was able to outmanuever Black Barax and devised the means to save his future world, Mister Terrific successfully freed the Coordinator and forced Barax into exile.

The citizens of the 76th century had already been bequeathed time travel technology from scientists of previous eras, such men as the Lord of Time and the Light who themselves had traveled forwards and backwards in time from their native centuries. While the Time Lord began his criminal career as an adversary of the Flash, the Light was originally a foe of Starman. Later, both men would branch out in their schemes and eventually clash with the Justice League (in Justice League of America #10 versus the entire team first in the 20th century and then in 3786) and the Justice Society (in All-Star Comics #10 versus Spectre in the 30th century ... while his teammates were occupied simultaneously on other cases also in 2941). While the Lord of Time eventually repents of his wayward ways when he fathers a noble daughter and six wicked sons, the Light simply retreated from villany to pursue private pursuits.