The "Death Star Plans" refer to the blueprints and technical specifications for the Death Star, a massive space station and superweapon in the Star Wars universe. These plans detail the station's construction, capabilities, and weaknesses, particularly its vulnerable thermal exhaust port. In the storyline, the plans become a crucial element in the conflict between the Rebel Alliance and the Galactic Empire. The Rebels seek to obtain the plans to exploit the Death Star's weaknesses, ultimately leading to significant battles in the series, including the iconic events of Star Wars: Episode IV - A New Hope.