Released in 1995, Mighty Morphin Power Rangers: The Movie is a movie starring the Mighty Morphin Power Rangers. It's notable as being possibly the first instance of said rangers using only original material, and not writing stories around fight scenes from the Super Sentai series. Despite this... that somehow doesn't (blog post) make it any more coherent...
Source: Mighty Morphin Power Rangers The Movie Movie Review - (blog post) Decker Shado