A New Hope

In a period of galactic civil war, Rebel Alliance spies have stolen blueprints to the Death Star, a colossal space station built by the Galactic Empire that is capable of destroying entire planets. Princess Leia Organa of Alderaan, secretly a rebel leader, has obtained the schematics, but her ship is intercepted and boarded by Imperial forces under the command of Darth Vader. Leia is taken prisoner, but the droids R2-D2 and C-3PO escape with the plans, crash-landing on the nearby desert planet of Tatooine. Darth Vader orders his troops to pursue the droids.
The droids are captured by Jawa traders, who sell them to the moisture farmers Owen and Beru Lars and their nephew, Luke Skywalker. While Luke is cleaning R2-D2, he discovers a recording of Leia requesting help from a former ally named Obi-Wan Kenobi. R2-D2 goes missing, and while searching for him, Luke is attacked by Sand People. He is rescued by the elderly hermit Ben Kenobi, who soon reveals himself as Obi-Wan. He tells Luke about his past as one of the Jedi Knights, peacekeepers of the former Galactic Republic, who drew mystical abilities from the Force, an energy field that connects all living beings. He explains that the Jedi were all but exterminated by the Empire. Luke learns that his father, also a Jedi, fought alongside Obi-Wan during the Clone Wars until Vader, Obi-Wan's former pupil, turned to the dark side of the Force and murdered him. Obi-Wan gives Luke his father's lightsaber, the signature weapon of the Jedi.
R2-D2 plays Leia's full message, in which she begs Obi-Wan to take the Death Star plans to Alderaan and give them to her father, a fellow veteran, for analysis. Luke initially declines Obi-Wan's offer to accompany him to Alderaan and learn the ways of the Force. However, he quickly changes his mind after Imperial stormtroopers murder his family and destroy his home while searching for the droids. Seeking a way off the planet, Luke and Obi-Wan travel with the droids to the city of Mos Eisley and hire the smuggler Han Solo and his Wookiee partner Chewbacca, pilots of the starship Millennium Falcon.
On the way to Alderaan, Obi-Wan begins Luke's training in the use of the Force. Meanwhile, the Death Star, under the command of Grand Moff Tarkin, obliterates Alderaan with its superlaser. It then captures the Falcon with a tractor beam, but Luke and his companions manage to avoid detection and infiltrate the station. Vader, however, senses Obi-Wan's presence, and begins searching for him. As Obi-Wan deactivates the tractor beam, Luke persuades Han and Chewbacca to help him rescue Leia, who is scheduled for execution after refusing to reveal the location of the rebel base. After disabling the tractor beam, Obi-Wan is killed by Darth Vader in a lightsaber duel, which allows the rest of the group to escape. Using a tracking device placed on the Falcon, the Empire locates the rebel base on the moon Yavin 4.
Analysis of the Death Star schematics reveals a weakness in a small exhaust port leading directly to the station's reactor. Luke joins the Rebellion's X-wing squadron in a desperate attack against the Death Star, while Han and Chewbacca leave to pay off a debt to the crime lord Jabba the Hutt. In the ensuing battle, Vader leads a squadron of TIE fighters and destroys several rebel ships, while Tarkin prepares to destroy Yavin 4 with the Death Star. Han and Chewbacca unexpectedly return in the Falcon, knocking Vader's ship off course before he can shoot Luke down. Guided by the voice of Obi-Wan's spirit, Luke uses the Force to aim his torpedoes into the exhaust port, causing the Death Star to explode moments before it can fire on the rebel base. In a triumphant ceremony, Leia awards Luke and Han medals for their heroism.