The time was 1976... a new era building upon the previous years that highlighted the Justice League and Justice Society. And with a new era, new superheroes debuted to train beside seasoned mentors. The Justice League established a base on the surface of Earth-One, in Gotham City, wherein four of their number and one Teen Titan trained teen proteges Marvin and Wendy... and later alien Wonder Twins Zan and Jayna... under the team name "Super Friends". Though the Society members (such as Hawkman, Flash, Green Lantern, Wildcat, Doctor Fate and Doctor Mid-Nite) were fluid in their membership while tutoring these terrific teens, the League appointed Super Friends remained the same fabulous five. The tutelage of their four young apprentices mirrored that of the Junior Justice Society who aided their mentors versus the Injustice Society and a gang of juvenile delinquents.
Meanwhile, in the Gotham City of Earth-Two, the Justice Society had six of its number mentor the younger Robin, Star-Spangled Kid and Power Girl under the banner of the "Super Squad"... later recruiting a fourth youngster known as the Huntress. The actual non-canonical tales of the Super Friends mirrored those of the Young All-Stars... who themselves were the Earth-Two equivalent of the quartet of Superman, Batman, Robin, Wonder Wonder Woman and Aquaman.... whose's tales had a basis in the main steam universes. Nevertheless, an aspect of the Super Friends was also replicated in the Super-Squad, both short-lived groups that filled a niche and bridged the generational gap.
The Twins, Zan and Jayna, were from the planet Exor and had the mutant ability when touching fists to transform into forms of water and shapes of animals, respectively. Fleeing persecution from their home world and starting new lives on Earth-One, they replaced former teen trainees Marvin and Wendy. Zan and Jayna's Earth-Two counterparts were Dyzan such as Kalla who possessses shape changing abilities allowing them to transform into animals. The mate of Kalla was a man named Arthur Gordon Pym aka Argor, grandfather of Neptune Perkins. In the Earth-Two reality which paralleled the Young All-Stars' history in some ways, the Dyzan would have met the real All-Stars. In yet another reality, the twins were known as Downpour and Shifter, blending the Exxor and Dyzan features of both. While there weee a few superpowered Dyzan who appeared, besides the Wonder Twins there was also Yeltu and Fegla.