Katherine Hillard is the only Mighty Morphin' Power Ranger

Katherine Hillard is the only Mighty Morphin' Power Ranger never to see the Dinozords, Thunderzords, White Tigerzord or Dragonzord in action. She is also the only Mighty Morphin' Power Ranger that has never met Zack the Black Ranger or Trini the Yellow Ranger. She is also the only Mighty Morphin' Power Ranger to never encounter the Putties.