Originally Posted by
CellarDweller
The image above is an early sketch for what would become "The All New Super Friends Hour".
At that time, the new Junior Super Friends (who still look like Wendy & Marvin) are a set of twins from another planet. Named "Dick" and "Jayne", they had very different powers and limitations. Dick was to have powers similar to Plastic Man, while Jayne was a shape-shifter, but not just into animals. She could change into trees, boulders, or whatever they wanted.
At that time, the limitations suggested that their powers were affected by sunlight, or by their proximity to each other.
Their pet monkey was named "Squeeks".
After a while, the characters were changed and they became Zan and Jayna, with Gleek.
This was talked about in an online article called "The Perplexing Popularity of The Wonder Twins", which also discusses the how the twins were based on Donny and Marie Osmond.