Power Rangers Spectrum

Power Rangers Spectrum (often abbreviated as PRSpec to avoid confusion with Power Rangers Samurai/PRSam, formally PRS) is the fourth series of the Blade Series. It  chronologically follows Power Rangers Worlds United, but goes back to the original system of continuing rangers from previous teams.

Summary
After a couple of years fighting along side each other, the Rainbow Rangers and the Nova Rangers encounter and energy syphon that has been collecting the energies of fallen foes that manifests into

Rangers
Main Arctice: Rainbow Force Rangers