The Tailed-People Clan Jashinka Empire are evolved from a race of reptiles. They arrived at Earth in ancient times, the life-forms being carried along with a meteorite, crashing into the earth, and falling deep into its core. As time went on, the life-forms evolved, becoming the civilized Tailed-People Clan. The Tailed-People are a civilization of advanced science (higher than human's), with the rank of their civilization being determined by the number of tails.
Believing Earth to be theirs, for their civilization to rise, they begin invasion. Originally planning to turn humans into their own kind, the experiment failed, and their strategy was changed to simply destroying mankind by reducing the number of human beings as the Tailed-People Clan was outnumbered.
Their rank and status is determined by the number of tails each member has. The more tails, the greater the status. As such, the Emperor's dream is to obtain a tenth tail, which is said to provide one with eternal life and powers.
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Several Tail Soldiers were part of an army of past enemy grunts that were fought by the Gokaigers in Los Dark's ghost dimension which housed the 1500 spirits of the villains defeated by the Super Sentai. After losing some of their number in an initial skirmish, the remaining members from each grunt group merged to form the Combined Combatant. Though the stronger opponent, the Combined Combatant proved to be unstable due to internal conflicting among the grunts composing him over who got to finish the pirates off. Taking advantage, the Gokaigers used the Battle Fever J Ranger Keys to destroy the Combined Combatant with the Penta Force cannon.