The Spirit World is the name of two different locations in the Power Rangers franchise.
Org Spirit World
The Org Spirit World is the afterlife of Orgs where they are sent after being destroyed in battle. After Master Org made him grow, Duke Org Onikage trapped the Wild Force Rangers here with his dark powers. In addition, he also summoned the spirits of Tombstone Org, Tire Org, Bell Org, Ship Org, Flute Org, and Clock Org to aid him. They were freed and able to destroy him when the Pegasus Megazord was created and arrived to aid them.
Master Org subsequently revived apparently mindless versions of Retinax, Nayzor, and Mandilok from the Spirit World to guard The Nexus while he completed his new Org Heart, but they were soon destroyed by the Rangers. Since then, the Spirit World is presumed to be the final state of all Orgs destroyed by the Rangers.
Jungle Fury version
The Spirit World is also the place of all who die in Power Rangers Jungle Fury. It is inhabited by masters like Master Rilla, Master Lope, Master Guin, and Master Mao. It is also inhabited by monsters that the Power Rangers have defeated.
- The Org Spirit World is similar to the Shadow World, Abyss of Evil, and Nighlok Heaven as a place where destroyed villains end up with the potential to be revived. It is unknown whether or not there is any connection between any of those realms. Either way, they each serve as different death realms for the destroyed monsters.