Orb of Doom

The Orb of Doom was a magical device used by Master Vile to reverse time on Earth, causing the Mighty Morphin Power Rangers to revert to child form and thus lose access to their powers. This was done in a bid to allow Vile and the forces under Rita Repulsa and Lord Zedd to take control of the Earth, but their attack was thwarted by the arrival of the Alien Rangers of Aquitar. The Orb of Doom's effects were later reversed.