Mighty Morphin Alien Rangers is a Power Rangers mini-series set within the end of the third season of Mighty Morphin Power Rangers.
As with the rest of the third season of Mighty Morphin Power Rangers, this mini-series adapted footage and costumes from the eighteenth Super Sentai series, Ninja Sentai Kakuranger.
During fight scenes (and during opening of the show) an alternate version of the MMPR theme song was played, saying "Go Go Alien Rangers" instead of "Go Go Power Rangers", although the premiere episode "Alien Rangers of Aquitar" still uses the "Go Go Power Rangers" theme.