The 1970s were a seminal decade for cinema, and every major genre had one big, standout movie, from The Exorcist in horror to The Godfather in drama.

On December 1st, all seven seasons of Mad Men are being added to HBO Max, marking the show’s return to streaming. Every episode will also be available to stream in 4K for the very first time.

Hollywood may have embraced blockbusters in the ’90s, but it’s an underrated decade when it comes to movies. Some of the ...