28. Order 66 ('Revenge of the Sith')
As Darth Sidious/Emperor Palpatine (Ian McDiarmid) unleashes his full plan to destroy the Republic and create the Empire, he initiates "Order 66" — the execution of all Jedi Knights by clone troopers and, of course, his new apprentice Anakin Skywalker. The slaughter of the the saga's spiritual, white-knight warriors is shocking to finally see — even children do not escape the Emperor's wrath. It's a dark moment in what's arguably the series' darkest film.