It's the very first Super Sentai series what made many of it's successors possible. If you want to watch the original first season of the Super Sentai series.
It's the 7th sequel of the series from Super Sentai right after Kagaku Sentai Dynaman which is the 6th sequel. If you would like to watch the super sentai series chronologically.
It's the 8th sequel of the series from Super Sentai right after Choudenshi Bioman which is the 7th sequel. If you would like to watch the super sentai series chronologically.