This might be considered cheating but Palpatine’s apprentice gets two introductions and they’re both good for different reasons. The first (or second depending on what order you watch the movies) comes in ROTS when we see Vader being assembled and see him rise for the first time, his humanity gone and a monster born – how unfortunate, then, that it has to be spoilt by the Simpsons-esque “Noooooooooooooo!” that follows. His next introduction is his finest: Vader, now a seasoned Sith, boards Leia Organa’s ship, ravaging everything and everyone in his path – now that’s badass.