During the 3-year run of Mighty Morphin Power Rangers, the Dinozords (which consists the Tyrannosaurus, Mastodon, Saber Tooth Tiger, Pteradactyl, and Triceratops) were the first set of Zords the Power Rangers first gained access to, in season 1. Then, in season 2, when Lord Zedd overthrown Rita and started a campaign of his own against our heroes, Zordon and Alpha had to upgrade the Rangers' Dinozords, turning them into their mighty and powerful Thunderzords (which consists the Red Dragon Thunderzord, the Lion Thunderzord, the Firebird Thunderzord, the Griffin Thunderzord, and the Unicorn Thunderzord). As s2 progressed, when Tommy returned as the White Ranger, he gained used of the mighty White Tiger Thunderzord. And later, in season 3, when Rita's skeleton-themed brother, Rito Revolto came along in Zedd's army, he had a mission to destroy the Rangers' Thunderzords and the original Power Coins, which would be almost the loss of their power (but it really was) until when the Power Team sought Ninjor's help and he gave them "Ninja Powers" and the much-powerful Ninjazords (which consists a Falcon, Frog, Wolf, Crane, Ape, and Bear). Also in season 3, the Shogunzords are introduced (following the introduction of Katherine Hillard in the series). By the near end of the series, when the Rangers lose their "Mighty Morphin" powers, prior to Master Vile's plan of time reversal, the Mighty Morphin Alien Rangers came around and took over, using mainly their Shogunzords but they mainly used their Battleborg forms.