Antagonist and Protagonist

Antagonist
An antagonist (opponent/villain/enemy) is usually a character, group, or institution which are against the protagonist(hero/heroine).  Generally a story/film consists of an hero fighting or defeating a villain, which are recognized as being the antagonist and protagonist. The antagonist can sometimes be regarded as a threat, or an obstacle that the protagonist has to tackle. However sometimes a producer makes the film/story in the antagonist point of view so in which the protagonist would be the supposed ''antagonist''. Antagonist usually provides the stories conflicts.
Protagonist
The protagonist is usually the main character, but it is known to also be a kind of helper for example the male hero who rescues a ''damsel in distress'' so in that case its not always the main character, but is one of them. The protagonist is usually the centre of the narrative and whom the audience share empathy with. The protagonist is usually faced with the threats, or obstacles that the antagonist presents to him/her. There is also a thing called a '' false protagonist'' for example sometimes in film, something will offer the character as a protagonist, and then dispose of that making it ''false''.





Antagonist and Protagonist in the trailer.
Prom night could be classed as both physiological and crime/action thriller, because of the narrative. In the trailer although we never get to see the characters face we can see who is the antagonist ( by costume, props, fact people are scared, running etc), and the fact the character is killing people and is looking for one particular character which is seen to be the ''damsel in distress'' but also, although its just a trailer it seems to the audience that the police officer/detective is the protagonist as he is trying to save the 'damsel' so it shows him as being the supposed 'hero' of the film and trying to find the protagonist by reassuring the damsel (victim) that she will be safe and that he is looking for the villian.