Thousands of years ago, four demons were trapped in a tomb by a powerful sorcerer. These demons threatened mankind, and lived only to conquer and destroy. A group of nomads opens the tomb, unwittingly releasing the demons into present day. The demons, led by Diabolico, seek to reclaim their city and palace, which is now a US city known as Mariner Bay. When defense organization Lightspeed hears of this news, they immediately initiate their emergency plan - to summon five hand picked individuals to utilize their technology to become Power Rangers, and defend the city from the demons' attacks.
The dreaded Diabolico and his army of evil demons wreak havoc wherever they go. They threaten to make Mariner Bay their stronghold on Earth. With powerful new Lightspeed Rescue Zords and amazing weapons, the Power Rangers take on this newest master of evil, battling to stop his destructive rampage and save the world.