Epic is a huge topic. It's epic. This time, I chose to talk about epic films. I guess the most easily recognizable type of epic films are those fiction and western long films, but I think epic can be more than that. For me, 'epic' is any film that creates a huge and elaborate set on a studio or outdoors to film even a small scene. For example, I think 'Singin' in the rain' is epic just for creating that extremely beautiful and realist stage for the 'Singin' in the rain' song scene.
In the same way, I consider the 'Wallace & Gromit', 'Fantastic Mr. Fox', and all those kind of animation films really epic. They created a whole world for little Plasticine figures to make a movie! It's amazing what people are capable to do in these films! I'm a fan of them!
Stanley Kubrick's 'A Clockwork Orange' is not only epic for its alarming story, but for the scenery and ths one-point perspective shots Kubrick used during the whole movie. It's epic!
Nowadays, people could also say that movies like 'Mission Impossible', 'James Bond' and such are also epic for the amount of special effects and all the action involved in those movies. But I don't think they can beat the old Clint Eastwood's epic westerns. I think it is more difficult nowadays to decide which films are epic and which films are not since now we can easily produce awful films that feature thousands of extras, memorable battles, huge studio stage productions, thousands of special effects, and such that can make a film look epic when it isn't. Mission Impossible, for example, features grand scenarios in the mysterious Moscow, there are a lot of epic special effects, memorable fights, and I have to say I really like that movie, but I don't know If I can qualify it as 'epic'.