HOTW- Astrea

 

From Wiki- Three young Earth people were selected many centuries ago and teleported to another planet, where they were given eternal youth and superpowers. They were trained and returned to Earth, where they are tasked with protecting the planet and its vicinity, similar to the Green Lantern Corps. Hercules and Mercury through superhuman feats became the basis for the mythological Roman deities of the same names. They are joined by Astrea, namesake of the Greek deity but with unrelated powers. Astrea can morph into any Earth animal and is the de facto field leader of the team. She was one of the very few black superheroes in cartoons of the era, along with Super Friends' Black Vulcan, and predating Superstretch and Microwoman. She was voiced by Dee Timberlake. Me again:

I liked this series when it first aired back in 1977, and even then was annoyed by the R2D2 clone that had to be inserted in every show.  Still, it was fun.  I recently re-watched the entire series, and liked it, despite the lack of action.  Astrea had cool powers and was the smartest of the group.