Ep 31. The Last Ranger

Diabolico sends Memorase to destroy the Power Rangers' memories. The Pink Ranger is the only Ranger who escapes Memorase's debilitating energy. Dana, with her memory still intact, guides the rest of the Rangers back to the Lightspeed Aquabase. At the Aquabase's infirmary, Miss F attempts to restore the Rangers' memories. Meanwhile, with the Rangers out of commission, Memorase begins to destroy the city. When the others regain consciousness, they join Dana in a fight against Memorase, forming the Lightspeed Megazord that helps them defeat their foe.