When movie lovers talk about the most influential films of all time, they usually stick to the classics of yesteryear. Some often mentioned names are Citizen Kane, The Searchers, The Godfather, Jaws, so on and so forth. All of these choices are equally valid and equally correct, but a truly industry-changing film doesn't have to wait 50 years to see the full range of its influence. Some movies change the industry within years, months, or even weeks, and one of these movies was released in 2007.

Tony Gilroy's Michael Clayton was hugely successful upon release, both in terms of box office and during the awards season, but the impact it would make is far bigger than any dollar amount. With a perfect screenplay and incredible performances from the likes of George Clooney and Tilda Swinton, this film is one of the best of its time. From the small yet exciting legal...