Page "Wonder Twins" Paragraph 16

According to the Super Friends comic book, Zan and Jayna are Exorian metas, genetic throwbacks to an ancient race of Exorian shapeshifters.

Their parents died when they were still babies during a plague, and, because of their origin, no Exorians want to adopt them.

They are adopted by the owner of a Space Circus who only wanted to use them as sideshow freaks.

Fortunately, the circus ' clown ( or " laugh-maker ") was a kind man and raised them.

He also gives them Gleek as a pet.

Eventually, as teens, the pair escape the circus and hide on a planet where a space villain called Grax ( an enemy of Superman ) had established his headquarters.

Spying on him, they learn that Grax was planning to destroy the Earth using hidden superbombs.

The twins decide to travel to Earth and warn the Justice League, which is how they come to replace Wendy and Marvin ( who were planning on retiring as heroes anyway ) as their sidekicks.

The heroes arrange for the kids to live with an old scientist named Professor Carter Nichols and they even take secret identities as John and Joanna Fleming.

" Johan " and " Johanna " were supposedly transfer students from Esko, Sweden, disguised with blonde hair ( Zan wore a wig, while Jayna uses her powers to transform into a human to change her hair color and ear shape ), to allow them to attend Gotham City High School.