The dramatic voice you hear while you watch the penguins' struggle to survive the harsh winter? That's not one of the penguins, it's the narrator.
The narrator is the person who tells the story. Usually, you find narrators in books and movies. In a fictional work, the narrator is a character who tells the story, which is different from the writer. Sometimes you have to decide if you trust the narrator's version of the story. If you want to be a narrator for a sports film, it might help to have a deep, gravelly voice.
