Continuity from SuperFriends Comic Book Zan and Jayna were born mutants on the planet Exxor. They are genetic throwbacks to an ancient race of Exxorian shapeshifters. While still infants, a great plague swept across Exxor killing hundreds, including their parents. The twins were raised in an interplanetary circus until such time that they came of age. While their they cared for Gleek. Soon they became frustrated with the enslaved life of a carnival performer, so they fled from Exxor and traveled to Earth where they eventually aided the Super Friends in battling the forces of Grax. Not long after the Wonder Twins first arrive on earth and help the Super Friends defeat Grax, their english is still not the greatest. The Super Friends ask Professor Nicholsif he would allow them to stay with him so he could teach them how to adjust to their new life on earth. He accepts, and he becomes their mentor. Meanwhile, the Super Friends also assist in training them at the Hall of Justice.
- Unique Physiology: Her and her brother's physiology is unique, even to their species, as they are mutants. As such, they have abilities other Exxorians do not have, but these abilities can only be activated when they are touching each other. Usually they make physical contact by giving each other a fist bump.
- Metamorphosis: Jayna can shape-shift into any animal she can think of. If she can envision a specific animal, she can transform into it.
- Animal Mimicry: Any animal form Jayna takes, she also takes on its' abilities. This includes mythological animals and animals from her home world of Exxor. If she turns into a bird, she can fly, if she becomes an elephant, she acquires the strength of that animal.
- Size Alteration: Her size depends on what animal she transforms into. If she becomes a mouse, she is incredibly tiny, but if she turns into a whale, her size increases.