Power Rangers: Zeo is a continuation of the television series Mighty Morphin Power Rangers. It is based on the Super Sentai series Chouriki Sentai Ohranger (translated as Super Power Task Force OhRanger). Power Rangers: Zeo is the first series in Power Rangers that is part of the annual Ranger suit change to match the annual change of the Super Sentai series.

In the series, after recovering from the destruction of the Command Center, the Rangers discovered the Zeo Crystal intact in the rubble. The Zeo Crystal guided them to a portal, which took them deep underground, where Zordon and Alpha 5 had survived by hiding in the heretofore unmentioned Power Chamber.

At this time, a new set of villains called the Machine Empire decided to take control of the Earth. They chased Rita Repulsa and Lord Zedd away from the moon, and Rito and Goldar were left on Earth, with no memories of their past.

The Rangers become the Zeo Rangers, empowered by the Zeo Crystal. Tanya Sloan joins the team as the new Yellow Zeo Ranger, while Billy Cranston becomes their technical advisor. Through their battles with the Machine Empire, they were sometimes aided by the mysterious Gold Ranger.

It turns out the Gold Ranger is an alien, Trey of Triforia. He is injured in battle, and is forced to pass on his powers to a worthy warrior while he heals. He first tries Billy, but it turns out that he has negative energy from the explosion of the Command Center . The powers then go to Jason Lee Scott, the original Red Power Ranger in the first generation.

Billy later leaves Earth to be with his alien girlfriend, Cestria, on Aquitar. The Gold Ranger powers return to Trey of Triforia.

Rangers

• Tommy Oliver, Zeo Ranger V Red and leader of the team (played by Jason David Frank)
• Adam Park, Zeo Ranger IV Green (played by Johnny Yong Bosch)
• Rocky DeSantos, Zeo Ranger III Blue (played by Steve Cardenas )
• Tanya Sloan, Zeo Ranger II Yellow (played by Nakia Burrise )
• Katherine 'Kat' Hillard, Zeo Ranger I Pink (played by Catherine Sutherland)
• Trey of Triforia, the original Gold Ranger (played by Ted, Tim and Tom DiFillipo)
• Jason Lee Scott, the second Gold Ranger (played by Austin St. John)

Allies

• Zordon
• Alpha 5
• Billy Cranston
• Cestria and the Aquitian Rangers
• Auric the Conqueror
• Bulk and Skull
• Lt./Detective Stone

Villains

• King Mondo
• Queen Machina
• Prince Sprocket
• Klank & Orbus
• Prince Gasket
• Archerina
• Louie Kaboom
• Lord Zedd
• Rita Repulsa
• Goldar
• Rito Revolto
• Finster

Monsters

• Defector
• Silo Monster
• Boohoo The Clown
• Mean Screen
• Fortissimodo
• Staroid
• Stenchy
• Toy Robot
• Punchabunch
• Varox
• Leaky Faucet
• Main Drain
• Mean Screen
• Mechanizer
• Mace Face
• Drill Master
• Digster
• Wolfbane
• Somnibot