Back onto the subject of prequels that worked, I think Temple of Doom did the job quite well. It didn't feel like a prequel, and regardless of how you feel about the quality of the story, nothing about it tried to explain anything from the other film. They didn't feel the need to tell us every mundane detail about Indy's past, such as the origins of his name, why he is afraid of snakes, exactly where he got his hat, or his whip, or that scar on his chin from, or dive deep into the details of his relationship with his father. Phew, imagine if they made an Indiana Jones prequel! I bet they'd squeeze all those things into it! Ugh, that'd be awful.