Mighty Morphin Power Rangers: Once and Always

When Trini, the yellow ranger is killed. The Mighty Morphing Power Rangers are called back into play nearly 30 years later of their successors coming in. Rita Repulsa manages to return as a super powered robot out for revenge using a time warp to ensure they are killed before ever being summoned to become rangers. The rangers must come together one last time to defeat their old nemesis or be erased from existence.