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Power Rangers: Zeo is the fourth season of the Power Rangers franchise that is a continuation of the television series Mighty Morphin Power Rangers. It is based on the Super Sentai series Chouriki Sentai Ohranger.

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. The new enemy comes in the form of the Machine Empire, who decide to take control of the Earth.

The Rangers become the Zeo Rangers, empowered by the Zeo Crystal. Tanya Sloan joined the team as Zeo Ranger II - Yellow, while Billy Cranston (formally the Blue Ranger) became their technical advisor. This season sees the addition of the Gold Ranger who occasionally added them in their battles. The Gold Zeo Ranger it turns out is an alien, Trey of Triforia.

The Zeo Rangers

Tommy Oliver (Jason David Frank): The Red Zeo Ranger; formerly the Green and White Power/Ninja Rangers.
Adam Park (Johnny Yong Bosch): The Green Zeo Ranger; formerly the second Black Power/Ninja Ranger.
Rocky DeSantos (Steve Cardenas): The Blue Zeo Ranger; formerly the second Red Power/Ninja Ranger.
Katherine Hillard (Catherine Sutherland): The Pink Zeo Ranger; formerly the second Pink Ninja Ranger.
Tanya Sloan (Nakia Burrise): The Yellow Zeo Ranger.
Trey of Triforia: The original Gold Zeo Ranger.
Jason Lee Scott (Austin St. John): The second Gold Zeo Ranger; formerly the original Red Power Ranger.