by James Eatock: http://bustatoons.blogspot.com/2007/07/nearly-double-trouble.html

As we can see here from the She-Ra Series Bible the character of Double Trouble was close to appearing in the Filmation cartoon, even being cited as Glimmer's cousin. Also note that her power is vastly different to that of her action figure! For one reason or another she was sadly never to appear in the series, though she did appear in a few books...