The Narrator only has these two lines. He needs to have a deep voice. A voice that you can listen to for hours without getting sick of it. Although he only has two lines, he is very important as he breaks the ice and tension. And without him, the film wouldn't start as it should. The film has some comedy in it, as serious as it is. It's silly, fun, and adventureous. The Narrator must give us that feeling using these two lines.