The Power Rangers franchise has decades of history, and the in-universe mythology goes back even further. The original team of "teenagers with attitude" from the original Mighty Morphin' Power Rangers was far from the team of Rangers in Power Rangers in Space. In fact, this concept is subtly backed up by the final entry in the classic "Zordon era."
Source：https://www.cbr.com/power-rangers-theory-space-rangers-predecessors/
