Hydrax is a alien plant and also the main antagonist of episode A-Bridged of Power Rangers SPD.
Hydrax is a criminal thief of intergalactic banks of Fernovian of the planet Fernovia. While she says on Earth, she soon disguises herself as a human named Diane, she hires Broodwing to get rid of T-Top. Yet Green Ranger frustates her plans and she is defeated by him and trapped in a die card. She was later cloned by Slate and Morgana to help destroy the SPD Rangers, plus she was destroyed by the Red Ranger along with the others criminals who were cloned.