Rescue of Princess Leia/Legends

While her ship was under attack, Princess Leia put a message inside R2-D2. When he and C-3PO landed on Tatooine, they were eventually bought by Luke Skywalker's uncle Owen Lars. While cleaning R2, Luke found the message that said: "Help me, Obi-Wan Kenobi. You're my only hope." He found Obi-Wan and when they heard the full message, they picked up a smuggler and his wookiee friend from the Mos Eisley Cantina and headed for Alderaan.

When they arrived there, the planet was nothing but an asteroid field. It had been destroyed by the Death Star's superlaser. While they were in the field, they were pulled into the Death Star by the tractor beam.

Inside, two Imperial stormtroopers checked Han's ship, the Millenium Falcon for intruders, but the occupants were ready, and killed the two troopers, taking their armor.

Han and Luke then made their way to the detention block that Leia was being held in with Chewbacca posing as a prisoner, while Obi-Wan went to shut off the tractor beam so that they could escape. When one of the officers got suspicious of the two "troopers", Luke, Han and Chewie had no choice but to blast their way through. They soon found Leia and let her out of her cell. However, troopers began pouring into the hallways and they had no choice but to jump into the garbage masher.

While down there, Luke was pulled into the water by a Dianoga. Han blasted it to save him, but their troubles had only began. The walls started to close in on them. Luke desperately called for 3PO's help, and just before they were squished, R2 was able to stop the mashers.

Meanwhile, Obi-Wan had shut down the tractor beams and on his way back to the Falcon, confronted his old apprentice, Darth Vader. They exchanged words and Obi-Wan ignited his lightsaber. They had a short duel in the room, while Luke and a group of Stormtroopers watched from outside. Obi-Wan sacrificed himself to help Luke escape, and became one with the Force when he died.

Luke gave away his position by screaming "NOO!". All of the troopers started shooting at him, but he was able to defeat them and lock Vader out of the hangar he was in by blasting the door controls. They all got in the Falcon and left, not knowing that the Empire was now tracking them.

Appearances
Star Wars Episode IV: A New Hope