Now known as "Star Wars: Episode IV: A New Hope".
An ancient order of knights, the Jedi Knights, are mentioned to have been guardians of peace in times past. Jedi knights also used "light sabers", a sword of sorts.
The Death Star is a notable example of a superweapon. The Galactic Empire builds a space station the size of a moon which is capable of destroying planets.
Obi-Wan Kenobi is an old, wise wizard, who acts as a mentor for Luke.