Power Rangers Zeo is a television series and the fourth season of the Power Rangers franchise, based on the 19th Super Sentai series Chouriki Sentai Ohranger. It is the continuation of Mighty Morphin Power Rangers, which aired in 1996.[1][2][3][4][5][6] Power Rangers Zeo is the first season of Power Rangers to follow the Super Sentai practice of annual Ranger suit changes.