1138 is the natural number following 1137 and preceding 1139.
George Lucas and Lucasfilm
One of George Lucas' early short films was Electronic Labyrinth: THX 1138 4EB, later remade into the 1971 feature film THX 1138. After the film, references to 1138 (and sometimes to THX) are scattered throughout Lucas' films, Lucasfilm productions and LucasArts computer games.
American Graffiti (1973): The number-plate of Paul Le Mat's deuce coupe is THX 138.
Star Wars Episode IV: A New Hope (1977): 1138 is the number of the cell block on the Death Star that Luke Skywalker claims to be transferring Chewbacca from. Additionally, the Imperial Stormtrooper suit Luke Skywalker stole in the Death Star belongs to a Stormtrooper with the registration TK-421, but this was scripted and appears in the novelization as THX 1138. Finally, when C-3PO asks Han and Luke what they should do if they are discovered in the hangar control of the Death Star, the monitor behind the robots shows "THX/1138".
Star Wars Episode V: The Empire Strikes Back (1980): In an approximation of the 1138 meme, General Rieekan issues the following order: "Send Rogues 10 and 11 to Station 3-8".
Raiders of the Lost Ark (1981): The number is heard spoken through an intercom in German, "Eins-eins-drei-acht". The wing number on a plane also reads THX-1138.
Star Wars Episode VI: Return of the Jedi (1983): The number 1138 is inscribed on the side of Boushh's helmet.
Indiana Jones and the Last Crusade (1989): 1138 is shown in Roman numerals (MCXXXVIII) in Dr. Jones' notebook in the library scene.
Star Wars: Episode I – The Phantom Menace (1999): 1138 can be seen on the back of the battle droid that Jar Jar Binks hits over the head after the destruction of the droid control ship.
Star Wars: Episode II – Attack of the Clones (2002): When Mace Windu orders a clone pilot to land in an assembly area, 1138 can be seen on the back of the pilot's helmet in LED lights. Later, when Padmé tumbles down a sand dune, 1138 can be briefly seen inscribed in the sand.
Star Wars: Episode III – Revenge of the Sith (2005): Although not spoken or seen in the final film, CC-1138 is the numerical designation for Commander Bacara, one of the clone troopers seen in the Order 66 sequence. The DVD release contains an Easter egg where a short video clip of Yoda break dancing is shown when the numbers 1-1-3-8 are entered on a remote control.
Indiana Jones and the Kingdom of the Crystal Skull (2008): A car in the opening scene has a license plate reading THX-138.
Star Wars: The Force Awakens (2015): A stormtrooper is referred to by the designation 1138 during the battle at Maz Kanata's castle.
Maniac Mansion: The number-plate of the Edison's Edsel car is THX 1138. The code for the safe is 1138. It is also one of the randomly chosen numbers for the Meteor Police in the NES and Commodore 64 versions.
Zak McKracken and the Alien Mindbenders: The phone bill says Zak owes $1138.
Outlaws: The train in the introduction has the number 1138 on its front.
Escape from Monkey Island: When Guybrush meets with his future self in the Mists O' Tyme Marsh, he asks him "If you really are me, then what number am I thinking right now?" One of the answers his alter ego might give is "1138". Later in the game, Guybrush meets a ghostly priest who has defied LeChuck, and also believes in "the Anti-LeChuck", a 10-foot-tall (3.0 m) demonized version of Guybrush with 1138 tattooed on his forehead.
Star Tours: When a guest is waiting in this Disney attraction's spaceport, various announcements can be heard over a PA system in between R2-D2 and C-3PO's conversations—one says: "will the owners of a red-and-black landspeeder, vehicle ID THX-1138, please return to your craft. You are parked in a no-hover area."
Star Wars: The Force Unleashed: Stormtroopers in the medical room refer to Starkiller as subject 1138.
Star Wars: Republic Commando: The lead character's codename is RC-1138
Star Wars: The Force Unleashed II: The clearance code to dock on the Salvation is 'Talus Haroon 10-11-38'. Since 10 is X in Roman numerals, the code can be read as 'TH X-11-38'.
Star Wars: Jedi Knight II: Jedi Outcast: In the cutscene preceding the first of the Cairn levels, an imperial voice is heard saying "Automated Transport 1-138".
Star Wars: Galactic Battlegrounds: When selecting an Trooper unit with the Imperial design (a Stormtrooper), he will sometimes say "THX-1138 ready, Sir."
