The powers of the Elements of Nature were long guarded by powerful giant Star Beasts based on the Constellations. Dark forces known as the Onyx Star Legion arose to defeat the Star Beasts and claim control over their elemental power. To ensure their powers couldn't be used by evil,each beast chose a human to be its avatar and wield its spirit and its element. Thus the Power Rangers Star Beasts were born. When the five Rangers found themselves outmatched, they learned of the existence of a Dinosaur Star beast and its White Ranger champion. Then the Guardian Star Beasts of two new constellations summoned their own Rangers to join the Star Beast Rangers. Later new Rangers from the future add their own powers to the team to help stop the time-traveling monsters known as the Fright Templars fro