Lynda Carter's Wonder Woman (1975 - 1979) captured the imagination of a generation of kids during the era of The Six Million Dollar Man (1974 - 1978) and The Bionic Woman (1976 - 1978). While Kenner had licensed those particular superhero programs, Mego released several large-scale, 12-inch action figures from Wonder Woman.
She was also released with Diana Prince's eyeglasses and Navy's uniform (yeoman), so she could maintain her disguise in America
In Canada, additional costumes were released for Diana Prince, though not in the United States. The toy figure had a re-release in 1978 with "new fly-away action!," though today I can't recall what that descriptor actually means.
Nubia was black, gorgeous, and wore silver body armor. The character never appeared on the TV program, though plans had been afoot for her to do so before the series switched networks for its third and final season.
The extremely rare Nubia came equipped with a shield, and a sword, and is one of those toys which I really wish I had bought, back when I was a kid. She looks....bad.
You can see Mego Wonder Woman battle Nubia below: