Mighty Morphin Alien Rangers is a Power Rangers mini-series set immediately after the end of the third season of Mighty Morphin Power Rangers. As with 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 the opening theme) an alternate version of the MMPR theme song was played, saying "Go Go Alien Rangers" instead of "Go Go Power Rangers", although the 2-part premiere episode "Alien Rangers of Aquitar" still uses the "Go Go Power Rangers" theme (as the episode was still part of Mighty Morphin Power Rangers).