Power Rangers Zeo was the third show in the long-running American sentai series, Power Rangers, airing in 1996 and following both the original Mighty Morphin' Power Rangers and Mighty Morphin' Alien Rangers. Like other shows in the series, the transformed segments of the show are taken from a Japanese Super Sentai show, in this case Chōriki Sentai Ohranger. The show follows the Alien Rangers after the destruction of Zordon's Command Center. Though now once again powerless, they are able to use the Zeo Crystal left behind by their foes to enter a new Ranger stage. From here, they fight the Machine Empire instead of Lord Zedd and Rita Repulsa.