The following is a list of crossovers between themes. This refers instances of full character designs carried across themes, appearances of characters or logos/symbols from other themes, and references to themes in various media based on other themes. Note the information will be organized in the section of the original theme, not the theme it later appeared in.
Adventurers[]
- Johnny Thunder appears in a number of sets from other themes. See here for specifics.
- Dr. Kilroy had a minor role on the Dinosaurs website, including providing gameplay tips and dinosaur facts for The Great LEGO Dino Quest online game.
- The Zookeeper works for a zoo where the adventurers brought a dinosaur back from Dino Island.
- The Grandma once dug for treasure with Johnny Thunder.
- The Creator set 10273 Haunted House is canonically the home of Samuel von Barron, and contains various direct references to the Egypt and Orient Expedition subthemes in its artifacts and lore.
Agents[]
- The Spy infiltrated Dr. Inferno's Volcano Base.
Alien Conquest[]
- The Alien Clinger appears as a costume headgear piece on a recurring background character in Ninjago: Masters of Spinjitzu.
- The Galaxy Patrol can resist Pluuvian Brain-Beast mind-control.
Alpha Team[]
- The Spy appears to be an updated version of Dash Justice's minifigure, and his description directly references the Alpha Team storyline and characters.
- 10273 Haunted House contains the Orb of OGEL, which was a stolen prototype Mind Control Orb.
Aqua Raiders[]
- In the Atlantis set 8078 Portal of Atlantis a skeleton has the same helmet as Aqua Raider.
BIONICLE[]
- The island of Voya Nui can be seen on one of the stickers in the City set 60262 Passenger Airplane. Its initials (VYN) can be seen on another sticker.
Blacktron[]
- The Blacktron logo appears on Blacktron Fan from The LEGO Movie theme.
- Rench in Space Police III wears an updated version of the original Blacktron spacesuit with the Future Generation logo. The lore of Space Police III also reveals that the Black Hole Gang is using Blacktron vehicles.
- The Space Villain, Evil Mech, and Galactic Bounty Hunter bear the emblems of Blacktron and Future Generation, and the Evil Mech is explicitly referred to as programmed by Blacktron while alluding to Future Generation. The Intergalactic Girl has also captured Blacktron fleets.
- Nanna has the Blacktron logo on her shirt.
Castle[]
- The Black Falcons emblem appears on Clay Moorington.
- The Forestmen emblem appears on Robot Hoodlum.
- The Fright Knights emblem appears on the Fright Knight.
- The Wolfpack emblem appears on Aaron Fox and Rogue.
Castle (2007)[]
- The crown symbol appears on Khanjikhan's belt and another Djinn King's statue in Ninjago: Masters of Spinjitzu.
Classic Space[]
- The Classic Space logo appears in the Friends set 41128 Amusement Park Space Ride.
- The Classic Space logo appears in The LEGO Movie and The LEGO Movie 2 sets 41636 Benny, 70816 Benny's Spaceship, Spaceship, SPACESHIP!, 70821 Emmet and Benny's 'Build and Fix' Workshop! and 70841 Benny's Space Squad.
- The Classic Space logo appears on Benny, Astro Kitty, Wyldstyle, Jenny, Kenny and Lenny from The LEGO Movie and The LEGO Movie 2 themes.
- The Classic Space logo appears on the Spaceman, Intergalactic Girl, Galaxy Patrol, Space Miner, Astronaut, Rocket Boy and Space Police Guy from the Minifigures theme.
- The Classic Space logo appears on all the astronauts from the Mars Mission theme.
- The Classic Space logo appears on Pete and Yve from the LEGO Ideas theme.
- The Classic Space logo appears on the Space Police Statue from the Space Police III theme.
- The Classic Space logo appears on a minifigure in the Creator set 10261 Roller Coaster.
- The Classic Space logo appears on a passenger in the City set 7893 Passenger Plane.
- The Classic Space logo appears on the NEXO Power Rocketship.
Classic Space Man from 10261 Roller Coaster
NEXO Power Rocketship
Clutch Powers[]
- Seven years after being mentioned in the Ninjago: Masters of Spinjitzu episode "The Royal Blacksmiths," Clutch Powers makes his first appearance in "Questing for Quests" and serves as a supporting character in a number of the following episodes. He also appeared in a couple of sets.
DC Comics[]
- GPL Tech from The LEGO Ninjago Movie has the Batman logo on her shirt.
Designer[]
- The Advanced Build submarine of 4888 Sea Explorers appears wrecked on the seafloor in various Atlantis media, including the The Atlantis Movie and one of the online wallpapers.
Atlantis wallpaper
Fabuland[]
- The Fabuland logo and a monkey appears on Fabu-Fan from The LEGO Movie theme.
Galaxy Squad[]
- In the November-December 2012 LEGO Club Magazine issue, a comic for Monster Fighters shows The Moon Stones' convergence alerting the insectoid aliens of Earth's existence.
- An older version of Solomon Blaze appears in Ultra Agents. The connection is further strengthened by the Spy, who rescued Blaze from Alien Buggoids as one of his profile's references to various secret agent LEGO themes.
Galidor[]
- The Galidor logo appears on Rufus McCallister from the LEGO Ninjago Movie theme.
- The Scientist studied the outer dimension to learn about swapping body parts.
Islanders[]
- The Island Warrior's description mentions Forbidden Cove and Enchanted Island.
Knights' Kingdom[]
- Cedric The Bull's emblem appears on the NEXO Power Bull Race.
Knights' Kingdom II[]
- Vladek is the great-great-great-great-great-grandfather of Ogel, as revealed by the LEGO Club interview "Ogel Speaks".
- The Sleepyhead had a dream about colorful knights with lightning-shooting swords, and the Evil Knight once worked for Vladek as a Shadow Knight.
Legends of Chima[]
- An edited version scene from "Ravens vs. Eagles" is used in the Ninjago: Masters of Spinjitzu episode, "Curseworld, Part II". Beavers subsequently appear in "The Kaiju Protocol" and "Ninjago Confidential.
- The Lion Temple appears as a hologram in the Nexo Knights episode, "The Power of Merlok." Eris appears as a hologram in the webisode, "Broom of Doom."
LEGO Island[]
- The Detective's description mentions The Brickster.
Monkie Kid[]
- The Boy from 80107 Spring Lantern Festival has the Monkie Kid logo on his shirt.
The LEGO Movie[]
- The N-POP Girl from The LEGO Ninjago Movie has Unikitty on her shirt.
Minifigures[]
- The Circus Clown, Motorcycle Mechanic, and Sea Captain appear in Ninjago: Masters of Spinjitzu.
- The Witch appears in the Nexo Knights webisode, "The Way to Battle."
- The Chicken Suit Guy appears on Chris McKay's shirt in The LEGO Movie.
- The Babysitter's baby appears in The LEGO Ninjago Movie.
- The Alien Trooper appears on the NEXO Power Cosmic Invasion.
- The Janitor is faintly visible in the background screen for the Ninjago website's "Virtual Tour" for Day of the Departed.
- The Bagpiper appears on a Vidiyo album cover.
- The Yeti appears as stickers representing toys in the Friends sets 41760 Igloo Holiday Adventure and 41756 Holiday Ski Slope and Café.
Monster Fighters[]
- Vampire Bat is implied to be working for Lord Vampyre, although he is secretly rooting for the Monster Fighters' victory.
- The Swamp Creature appears in 71023 The LEGO Movie 2 Collectible Minifigures.
M-Tron[]
- Nancy from The LEGO Ninjago Movie has the M-Tron logo on her shirt.
Ninjago[]
- Lloyd appears in The LEGO Movie and "Enter the Ninjago," a DVD extra for the film.
- Nya's phoenix symbol is reused on the walls of the Phoenix Temple in Legends of Chima, as seen in the episode, "The Crescent."
- In the Nexo Knights episode, "The Golden Castle," one of the film ideas pitched to Lance Richmond is "Knightjago 3." Moments later, a squirebot rehearses for a villainous role while wearing a mask that resembles Lord Garmadon.
- At the beginning of the LEGO Friends episode, "Andrea's Big Moment," Nya can be seen in one of Emma's paintings. The painting is a redraw of Nya's 2011 character art in the LEGO Friends style.
- In the LEGOLAND set 40429 Ninjago World one of the minifigures has Lloyd on his torso.
- In the City set 60291 Family House one of the minifigures has Lloyd on his torso.
Pharaoh's Quest[]
- Jake Raines' eagle symbol appears on Twitchy Tim from Ninjago.
Power Miners[]
Studios[]
- The Thespian's career began at LEGO Studios.
Town[]
- The Postal Service symbol appears on the Postman from Ninjago: Masters of Spinjitzu.
Ultra Agents[]
- Toxikita and Invizable's designs are repurposed as the characters Tox and Mr. Pale in Ninjago: Masters of Spinjitzu.
Vidiyo[]
- Shark Singer appears on a sticker in the City set 60290 Skate Park.