L.L. McKinney 
Power Rangers Unlimited: Heir to Darkness #1 [PDF ebook] 

Astronema is one of the most popular Power Rangers villains ever and her true origin is revealed for the first time in a one-shot directly connected to the events of Mighty Morphin and Power Rangers! Before she became a Power Ranger, a young girl named Karone was kidnapped by bounty hunters and brainwashed into the assassin known as Astronema by two of the greatest threats in the galaxy – Dark Specter and Ecliptor. But what is Dark Spector’s true plan…and what does it mean for the new Mighty Morphin & Power Rangers teams? Acclaimed author L.L. Mc Kinney (A Blade So Black) and artist Simone Ragazzoni (Power Rangers: Drakkon New Dawn) present a powerful new story that no Power Rangers fan can miss.