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LEGO Alternate Builds!

  • SETS
    • Adventurers
    • Aquazone
    • Belville
    • Building Set with People
    • Castle
    • Duplo
    • Fabuland
    • Harry Potter
    • Holiday and Event
    • LEGOLAND
    • Model Team
    • Pirates
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    • Star Wars
    • Technic
    • Town
    • Universal Building Set
    • Western
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    • Misc
  • USEFUL LINKS
    • Submit Instructions!
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    • How BOTBB was Built
  • THIS IS AN INDEPENDENT SITE NOT AUTHORIZED OR SPONSORED BY THE LEGO GROUP

Concepts and Prototypes

Blacktron Blacktron Alternate Builds Captain Indigo Concepts and Prototypes Instructions Added LEGO Builders Club LEGO Magazine Space Very Small Alt Build Very Small Builds 

T42

March 9, 2025March 22, 2025 Master Builder 5296 Views

MiscBuild: T42 Instructions: View PDF | Download .io File Also Pictured: Blacktron Time Machine Bricks n Pieces: Spring 1988 – Page 4UK LEGO

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Blacktron Blacktron Alternate Builds Captain Indigo Concepts and Prototypes Instructions Added LEGO Builders Club LEGO Magazine Small Alt Build Small Builds Space 

Blacktron Time Machine

March 1, 2025March 22, 2025 Master Builder 5195 Views

MiscBuild: Blacktron Time Machine Instructions: View PDF | Download .io File Also pictured: T42 Bricks n Pieces: Spring 1988 – Page 4UK LEGO

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ABCs Concepts and Prototypes Sea People Sea-Tron Space 

Sea People

February 12, 2025February 12, 2025 Master Builder 4317 Views

MiscTheme: Seatron, Aquadome *Alternate Build Connection: Aquazone BrickJournal: Issue 6 Volume 2 – Page 43TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal

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ABCs Concepts and Prototypes Sea People Sea-Tron Space 

Aquadome

February 11, 2025February 18, 2025 Master Builder 4545 Views

MiscTheme: Seatron, Sea People *Alternate Build Connection: Aquazone, 6195: Neptune Discovery Lab (Aqua Dome 7), 6199: Hydro Crystalization Station LEGO®

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Concepts and Prototypes Grey:tron Grøntrøn Space 

Greytron

February 11, 2025February 11, 2025 Master Builder 4544 Views

MiscTheme: Greytron (Not Official) BrickJournal: Issue 6 Volume 2 – Page 42TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives LEGO®

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Concepts and Prototypes LEGO Builders Club LEGO Magazine You Can Build This 

Swinging On A Star

February 6, 2025March 22, 2025 Master Builder 5064 Views

MiscBuild: Would You Like to Swing on a StarSubmitted By: USERInstructions: Also pictured: Islander Mask Brick Kicks: Fall 1994 –

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ABCs Adventurers Adventurers Alternate Builds Concepts and Prototypes Desert You Can Build This 

Desert Buggy

February 6, 2025March 22, 2025 Master Builder 4910 Views

MiscBuild: Desert BuggySubmitted By: USERInstructions: *Alternate Build Connection: 5918: Scorpion Detector LEGO Mania Magazine: May-June 1998 – Page 7US LEGO

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ABCs Concepts and Prototypes Futuron Futuron Alternate Builds LEGO Builders Club LEGO Magazine Space You Can Build This 

Space Sunglasses

February 6, 2025March 22, 2025 Master Builder 4916 Views

MiscBuild: Space SunglassesSubmitted By: USERInstructions: *Alternate Build Connection: 6990: Futuron Monorail Transport System Brick Kicks: Fall 1989 – Page 7US LEGO

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Concepts and Prototypes LEGO Builders Club LEGO Magazine 

Marble Run

February 5, 2025March 22, 2025 Master Builder 4938 Views

MiscBuild: Marble RunSubmitted By: USERInstructions: Bricks n Pieces: Autumn 1987 – Page 10UK LEGO Club Magazine 

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ABCs Concepts and Prototypes Islanders LEGO Builders Club LEGO Magazine Pirates You Can Build This 

Islander Mask

January 26, 2025March 22, 2025 Master Builder 5100 Views

MiscBuild: Islander MaskSubmitted By: USERInstructions: *Alternate Build Connection: Islanders Also pictured: Swinging On A Star Brick Kicks: Fall 1994 –

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ABCs Aquazone Concepts and Prototypes You Can Build This 

Aqua Rover

January 18, 2025March 22, 2025 Master Builder 5055 Views

MiscBuild: Aqua Rover (Inspired by Aqua Cat)Submitted By: USERInstructions: *Alternate Build Connection: 6150: Crystal Detector LEGO Mania Magazine: May-June 1998 –

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Concepts and Prototypes M:Tron M:Tron Alternate Builds Space 

M:Tron Prototypes

January 23, 2024February 12, 2025 Master Builder 5465 Views

MiscTheme: M:Tron, Rtron (Not Official) BrickJournal: Issue 6 Volume 2 – Page 40TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives BrickJournal:

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Classic Space Classic Space Alternate Builds Concepts and Prototypes Space 

Classic Space Moon Base Concept

January 1, 2024February 12, 2025 Master Builder 4427 Views

MiscTheme: Classic Space LEGO® Space: 1978-1992 – Page 156Published: 2023By: Tim JohnsonDark Horse Books Build: TBDSubmitted By: USERInstructions

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Classic Space Classic Space Alternate Builds Concepts and Prototypes Space 

Robot Prototypes

January 1, 2024February 11, 2025 Master Builder 4292 Views

MiscTheme: Classic Space LEGO® Space: 1978-1992 – Page 156Published: 2023By: Tim JohnsonDark Horse Books Build 1: Build: 2: Build 3:

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Classic Space Classic Space Alternate Builds Concepts and Prototypes Space 

Space Technic Concept

January 1, 2024February 11, 2025 Master Builder 4591 Views

MiscTheme: Space Technic LEGO® Space: 1978-1992 – Page 156Published: 2023By: Tim JohnsonDark Horse Books Build: TBDSubmitted By: USERInstructions

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Concepts and Prototypes 

LEGO® Space: 1978-1992

January 1, 2024January 23, 2024 Master Builder 4446 Views

MiscPublished: 2023By: Tim JohnsonDark Horse Books

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Concepts and Prototypes Instructions Added Medium Alt Build Medium Builds R-TRON R:Tron Space 

Rtron

August 14, 2023February 12, 2025 Master Builder 5067 Views

MiscTheme: Rtron (Not Official), M:Tron Prototypes BrickJournal: Issue 6 Volume 2 – Page 41TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO

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Concepts and Prototypes Instructions Added M:Tron M:Tron Alternate Builds Small Alt Build Small Builds Space 

BrickJournal Issue 6 Volume 2 Page 40 – Proto 2

June 24, 2023August 15, 2023 Master Builder 3989 Views

BrickJournal Issue 6 Volume 2TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives Name: M-Tron Transforming Vehicle Instructions: View PDF

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Concepts and Prototypes Instructions Added M:Tron M:Tron Alternate Builds Small Alt Build Small Builds Space 

BrickJournal Issue 6 Volume 2 Page 40 – Proto 1

June 24, 2023August 15, 2023 Master Builder 3933 Views

BrickJournal Issue 6 Volume 2TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives Name: M-Tron Walker Instructions: View PDF

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Concepts and Prototypes Instructions Added M:Tron M:Tron Alternate Builds Small Alt Build Small Builds Space 

BrickJournal Issue 6 Volume 2 Page 40 – Proto 5

June 22, 2023August 15, 2023 Master Builder 3593 Views

BrickJournal Issue 6 Volume 2TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives Name: M-Tron Powersuit #2 Instructions: View PDF

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Concepts and Prototypes Instructions Added M:Tron M:Tron Alternate Builds Small Alt Build Small Builds Space 

BrickJournal Issue 12 Page 77 – Proto 1

June 22, 2023August 15, 2023 Master Builder 3816 Views

BrickJournal Issue 12TwoMorrows PublishingPhoto credit the LEGO® Group and Mark Stafford Name: M-Tron Forklift Mecha Instructions: View PDF

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ABCs Concepts and Prototypes Instructions Added M:Tron M:Tron Alternate Builds Small Alt Build Small Builds Space 

BrickJournal Issue 6 Volume 2 Page 40 – Proto 4

June 21, 2023August 15, 2023 Master Builder 3872 Views

BrickJournal Issue 6 Volume 2TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives Name: M-Tron Powersuit Instructions: View PDF *Alternate Build Connection: 7703

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ABCs Concepts and Prototypes Instructions Added M:Tron M:Tron Alternate Builds Small Alt Build Small Builds Space 

BrickJournal Issue 6 Volume 2 Page 40 – Proto 3

June 21, 2023August 15, 2023 Master Builder 3752 Views

BrickJournal Issue 6 Volume 2TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives Name: M-Tron Crane Instructions: View PDF *Alternate Build Connection: 6352:

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ABCs Classic Space Classic Space Alternate Builds Concepts and Prototypes Instructions Added Large Alt Build Space 

Classic Space Remote Controlled Vehicle

May 26, 2023February 12, 2025 Master Builder 4338 Views

MiscTheme: Classic Space BrickJournal: Issue 6 Volume 2 – Page 39TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives Name: Classic

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ABCs Concepts and Prototypes Sea People Sea-Tron Space 

Seatron

February 23, 2023February 12, 2025 Master Builder 4516 Views

MiscTheme: Seatron, Sea People, Aquadome *Alternate Build Connection: Aquazone BrickJournal: Issue 6 Volume 2 – Page 43TwoMorrows PublishingPhoto Credit: Niels

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Concepts and Prototypes Sea People Sea-Tron Space 

BrickJournal Issue 6 Volume 2 Page 43 – Proto 1

February 23, 2023August 15, 2023 Master Builder 3832 Views

BrickJournal Issue 6 Volume 2TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives

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Concepts and Prototypes Sea People Sea-Tron Space 

BrickJournal Issue 6 Volume 2 Page 43 – Concept 1

February 23, 2023August 15, 2023 Master Builder 3602 Views

BrickJournal Issue 6 Volume 2TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives

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Concepts and Prototypes Space 

Blacktron II Prototypes

February 23, 2023February 11, 2025 Master Builder 4078 Views

MiscTheme: Blacktron II BrickJournal Issue 6 Volume 2 – Page 42TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives Build 1:

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Concepts and Prototypes Grey:tron Grøntrøn Space 

BrickJournal Issue 6 Volume 2 Page 42 – Concept 1

February 23, 2023August 15, 2023 Master Builder 3658 Views

BrickJournal Issue 6 Volume 2TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives

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Concepts and Prototypes Space 

Alien Prototype

February 23, 2023February 12, 2025 Master Builder 4043 Views

MiscTheme: Space BrickJournal: Issue 6 Volume 2 – Page 41TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives Build: TBDSubmitted By:

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Concepts and Prototypes Space Space Police I Space Police I Alternate Builds Space Police II Space Police II Alternate Builds 

Space Police II Concept

February 23, 2023February 11, 2025 Master Builder 4393 Views

MiscTheme: Space Police II BrickJournal: Issue 6 Volume 2 – Page 39TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives Build

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ABCs Blacktron Blacktron Alternate Builds Blacktron II Blacktron II Alternate Builds Concepts and Prototypes Space 

Blacktron Concept

February 23, 2023February 11, 2025 Master Builder 4583 Views

MiscTheme: Blacktron BrickJournal: Issue 6 Volume 2 – Page 39TwoMorrows PublishingPhoto Credit: Niels Milan Pedersen’s personal LEGO archives Build 1: TBDSubmitted

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Concepts and Prototypes 

BrickJournal Issue 6 Volume 2

February 23, 2023August 15, 2023 Master Builder 4564 Views

MiscPublished: Summer 2009TwoMorrows Publishing

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Concepts and Prototypes 

BrickJournal Issue 12

February 23, 2023August 15, 2023 Master Builder 3600 Views

MiscPublished: October 2010TwoMorrows Publishing

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EXPLORE MORE OFFICIAL SETS

4593: Zero Hurricane & Red Blizzard
Drome Racers Official Sets Racers Small Builds 

4593: Zero Hurricane & Red Blizzard

January 27, 2025February 21, 2025 Master Builder

Year Released: 2002BricklinkInstructions

6086: Black Knight’s Castle
Black Knights Castle Castle Sets Extra Large Builds Niels Milan Pedersen Official Sets 

6086: Black Knight’s Castle

October 11, 2021July 29, 2023 Master Builder
6971: Inter-Galactic Command Base
Classic Space Classic Space Sets Large Builds Official Sets 

6971: Inter-Galactic Command Base

September 12, 2019September 28, 2019 Master Builder
6823: Surface Transport
Classic Space Classic Space Sets Official Sets Very Small Builds 

6823: Surface Transport

September 30, 2019September 30, 2019 Master Builder
6833: Beacon Tracer
M:Tron M:Tron Sets Official Sets Space Very Small Builds 

6833: Beacon Tracer

April 11, 2020April 11, 2020 Master Builder
6815: Hovertron
Exploriens Exploriens Sets Official Sets Space Very Small Builds 

6815: Hovertron

June 28, 2022June 28, 2022 Master Builder
4583: Maverick Storm
Drome Racers Official Sets Racers Very Small Builds 

4583: Maverick Storm

October 22, 2021February 21, 2025 Master Builder
6987: Message Intercept Base
Blacktron Blacktron Sets Daniel August Krentz Extra Large Builds Official Sets Space 

6987: Message Intercept Base

September 12, 2019August 4, 2023 Master Builder
6941: Battrax
Blacktron Blacktron Sets Large Builds Official Sets 

6941: Battrax

September 13, 2019September 28, 2019 Master Builder
375 (6075): Castle
Castle Castle Sets Classic Castle Daniel August Krentz Different Set Numbers Duplicate Set Number Extra Large Builds Official Sets 

375 (6075): Castle

November 8, 2019March 11, 2024 Master Builder
1966: Car Repair Shop
Classic Town Large Builds Official Sets Town Town Sets Traffic 

1966: Car Repair Shop

May 16, 2025May 16, 2025 Master Builder
5978: Sphinx Secret Surprise
Adventurers Adventurers Sets Desert Large Builds Official Sets 

5978: Sphinx Secret Surprise

October 28, 2019April 4, 2020 Master Builder
6681: Police Van
Classic Town Official Sets Police Small Builds Town Town Sets 

6681: Police Van

October 13, 2021October 13, 2021 Master Builder
7141: Naboo Fighter
Episode I Medium Builds Official Sets Star Wars Star Wars Sets 

7141: Naboo Fighter

December 29, 2021December 29, 2021 Master Builder
4920: Rapid Rider
Official Sets Rock Raiders Rock Raiders Sets Very Small Builds 

4920: Rapid Rider

March 1, 2023March 1, 2023 Master Builder
6351: Surf N’ Sail Camper
Classic Town Medium Builds Official Sets Recreation Town Town Sets 

6351: Surf N’ Sail Camper

July 14, 2021July 14, 2021 Master Builder

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About This Site

Logo
There were once pictures of additional LEGO® builds on the back of set boxes. Written on the boxes was typically something about the endless building possibilities, "Build any of these exciting models with this set!" There were no instructions for these alternate builds, until now.

Sets

  • Adventurers
  • Aquazone
  • Belville
  • Building Set with People
  • Castle
  • Duplo
  • Fabuland
  • Harry Potter
  • Holiday and Event
  • LEGOLAND
  • Model Team
  • Pirates
  • Space
  • Star Wars
  • Technic
  • Town
  • Universal Building Set
  • Western
  • More Sets
  • Misc

Useful Links

  • Submit Instructions!
  • New Instructions
  • New Official Sets
  • New Alternate Builds
  • Minifigs
  • Very Small Builds (<35 pcs)
  • Small Builds (<100 pcs)
  • Medium Builds (<200 pcs)
  • Large Builds (<400 pcs)
  • Extra Large Builds (>400 pcs)
  • How BOTBB was Built

In Honor of 1526

The classic space set that never was.

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