While a lot of Power Rangers episodes follow the classic monster of the week formula, some stand out due to their writing and how different they are from the rest of the show. Even the best Power Rangers seasons were limited by the shows formulaic structure, which includes always having a Megazord fight and giving the heroes a happy ending. This is why, whenever Power Rangers would break that formula, the result was always an incredible episode.

https://screenrant.com/power-rangers-masterfully-written-episodes/