Southern Cross

It is twenty years after the invasion of the Zentraedi was beaten off. Now the Robotech Masters of the Zentraedi have returned to Earth to finish the job. And only young Dana Sterling , half-human, half-Zentraedi , can save the Earth . . . or destroy it.
The Robotech slave-warriors, the Zentraedi, return to Earth twenty years after their first attack, and a battle-ravaged Earth must defend itself once more. This is the moment when young Dana Sterling, half human, half Zentraedi, steps squarely into the spotlight of interstellar history. Original.