Hmmmm....interesting question.
Zordon: wiped out all of the Evil in the universe from the Zordon-era at the cost of his life.
Episode one: 34 SS wiped out one Zangyack fleet in one kamekazi attack, at the cost of their Sentai powers and equipment, but were scattered in space and recovered by Aka Red and changed in the form of the Rangers Keys so that he would present to Capt. Marvelous to ensure that Marvelous would assemble the Goukaigers in his honor. (More info in the upcoming 34th SS Anniversary film.)