Shadow World

The Shadow World, which appeared in Power Rangers Lightspeed Rescue is  a dark, desert-like world where all the villains the Power Rangers of the past, present and future destroyed, end up. It is something like Hell. In a climactic battle between Queen Bansheera and the Power Rangers, the spirit of her second-in-command Diabolico cut the rope that she was using to escape the Shadow World's portal, and she fell in. Then the portal sealed up permanently