The best science fiction and fantasy stories capture our imaginations in all sorts of ways — with cool visuals, with neat ideas, with clever worldbuilding. But sometimes the most powerful thing of all can be just one person, speaking eloquently. What's the greatest speech in any work of science fiction or fantasy?

Please include a clip, picture, poster, book cover, comics panel, piece of fan art, or other visual representation of your favorite speech. And please mention the name of the character speaking, where they said it, and why the speech was so great. (And if it's fan art, please credit the artist and link back.) Thanks!

Top image: Mal Reynolds' famous "I aim to misbehave" speech in Serenity. Gets the blood stirring every time.