The harsh and relentless style full of violence, bloody brutality, and vulgar language certainly was highly present.
Spielberg understood that this film could and would work and although there is a science fiction element to it, he understood the character development and relationship that was under the surface of the time traveling adventure. The Bobs had their reservations though. Because they both had attached Spielberg in their previous last 3 flops they knew that they would be finished in the industry if “Back to the Future” didn’t succeed. In the Words of Doc Brown….”We Must Succeed” It wasn’t until Zemeckis finally had a hit in Romancing the Stone (1984) that they now had a credible Director who could go to one of the biggest names in Hollywood and the rest they say is (pardon the pun) history.
Let’s be clear on the poster they don’t call this Part 4 but it is and they called it the Final Chapter and it wasn’t not by a long shot.