Before watching the movie:
The Seven Samurai has been remade and recontextualized and homaged many, many times. Its best known remake is of course the Western The Magnificent Seven, but pretty much every “go put together a group of mercenaries to save the hometown” story is probably based on Seven Samurai. However, I don’t think I’ve ever seen a movie do it so blatantly that the tagline itself invokes Magnificent Seven. Apparently Roger Corman wanted to do something like Star Wars and decided to do a sci-fi interpretation of Seven Samurai. So he did.