Tommy, Billy, Adam, Rocky, Kat and Tanya are turned back to their teenage forms thanks to the Zeo Crystal. The Command Center is gone but the crystal leads them to the new Power Chamber and all but Billy take on new Zeo powers.
How many Power Ranger spin-offs, and just plain knock-offs, were there in 90s and early 2000s? Frankly, the mind boggles. It appears the Mighty Morphin' Power Rangers phenomenon employed a whole generation of athletic teen actors for a decade.