1. Sets
  2. Ideas
  3. Promotional
40912 LEGO Ideas Sea Serpent thumbnail image

40912 LEGO Ideas Sea Serpent
Images 3
40912 LEGO Ideas Sea Serpent
  • Sea Serpent thumbnail
  • Sea Serpent thumbnail
  • Sea Serpent thumbnail

LEGO 40912 Sea Serpent is an upcoming Ideas set with an expected retail price of $24.99, expected to release on July 7, 2026. Pre-order prices on the secondary market are currently around $58.

Forecast Model

This represents the expected annual growth (CAGR) based solely on a forecast model.
LEGO 40912 Sea Serpent is a 241 piece Ideas set with 2 minifigs pending release in 2026. The GWP is a modern remake of LEGO 6057 Sea Serpent, a Castle set released in 1992. The model recreates a Black Knights ship with a black hull, blue railings, brown deck details, a front-mounted cannon, oars, shields, and a large fabric sail printed with a red sea serpent emblem. It includes two Black Knights minifigures with helmets, weapons, and shields. The set was based on the winning entry from the LEGO Ideas A Twist of Nostalgia challenge.
Retirement risk. Sea Serpent is expected to retire on or around July 14, 2026.
All regions

For Sale (New/Sealed)

 (US) #40912 Sea Serpent GWP: Brand New/Sealed: Ships on July 15th: PREORDER
BrickEconomy Choice
$54.95
(US) Sea Serpent 40912, NEW Sealed Pre Order $62.50
(US) IDEAS Sea Serpent Set 40912, Brand New, GWP pre-order $63.90

Sets in Ideas / Promotional

40487 Sailboat Adventure

Theme / Subtheme Ideas / Promotional
Year 2021
Pieces / Minifigs 330 / 2
Availability Retired
40487 LEGO Ideas Sailboat Adventure
promotional
Value $25.00
Annual growth 39.3%

40595 Tribute to Galileo Galilei

Theme / Subtheme Ideas / Promotional
Year 2023
Pieces / Minifigs 307 / 1
Availability Retired
40595 LEGO Ideas Tribute to Galileo Galilei
promotional
Value $42.71
Annual growth 5.3%

40698 Books Are My Passion

Theme / Subtheme Ideas / Promotional
Year 2024
Pieces 285
Availability Retired
40698 LEGO Ideas Books Are My Passion
promotional
Value $85.00
Annual growth 19.3%

40788 Friendly Snails

Theme / Subtheme Ideas / Promotional
Year 2025
Pieces 264
Availability Retired
40788 LEGO Ideas Friendly Snails
promotional
Value $49.57

40566 Ray the Castaway

Theme / Subtheme Ideas / Promotional
Year 2022
Pieces / Minifigs 239 / 1
Availability Retired
40566 LEGO Ideas Ray the Castaway
promotional
Value $24.00
Annual growth 32.2%

40786 Micro Command Center

Theme / Subtheme Ideas / Promotional
Year 2025
Pieces / Minifigs 214 / 1
40786 LEGO Ideas Micro Command Center
promotional
Value $36.40

40789 Flying Moon Car

Theme / Subtheme Ideas / Promotional
Year 2025
Pieces / Minifigs 211 / 2
Availability Retired
40789 LEGO Ideas Flying Moon Car
promotional
Value $35.00

40533 Cosmic Cardboard Adventures

Theme / Subtheme Ideas / Promotional
Year 2022
Pieces / Minifigs 203 / 1
Availability Retired
40533 LEGO Ideas Cosmic Cardboard Adventures
promotional
Value $19.82
Annual growth 31.3%

40448 Vintage Car

Theme / Subtheme Ideas / Promotional
Year 2021
Pieces / Minifigs 189 / 2
Availability Retired
40448 LEGO Ideas Vintage Car
promotional
Value $25.00
Annual growth 37.3%

40773 The Goonies The Walshes' Attic

Theme / Subtheme Ideas / Promotional
Year 2025
Pieces / Minifigs 179 / 2
Availability Retired
40773 LEGO Ideas The Goonies The Walshes' Attic
promotional
Value $90.00

40335 Space Rocket Ride

Theme / Subtheme Ideas / Promotional
Year 2019
Pieces / Minifigs 154 / 1
Availability Retired
40335 LEGO Ideas Space Rocket Ride
Retail $12.99
Value $29.99
Growth  +130.9%
Annual growth 12.6%

My Collection

Sea Serpent Reviews

Jays Brick Blog
“This model is a modern remake of 6057 Sea Serpent, which was released in 1992, and is likely a set that many of us have fond memories of playing. LEGO Ideas turned this concept into a model, as it was the winner of the A Twist of Nostalgia challenge, with HallowedBrick02’s... More Sea Serpent emerging triumphant amongst a field of retro-themed Ideas!”
Full review at jaysbrickblog.com
Brick Fanatics
“While 40912 Sea Serpent mirrors the overall shaping of the original submission pretty closely, there are still quite substantial changes to both the stern and bow when you look a little closer. Starting from the back of the ship, the squared-off modular stern now makes use... More of hinge plates to angle the side walls, which swing open to allow for internal access (rather than removing the roof).”
Full review at www.brickfanatics.com

About Ideas Promotional

The LEGO Ideas theme, which started in 2008 as an offshoot of the Japanese website Cuusoo, then formally known as LEGO Cuusoo, is based around a website which allows users to submit ideas for LEGO products to be turned into potential sets available commercially. If fellow users in the LEGO Ideas community up vote the project to 10000 then LEGO Group has a committee which votes on whether to build the set and release it. If the project is approved and cleared for production, it is developed and later released as an official set under the "LEGO Ideas" banner and the original designer receives 1% of the royalties and a number of free sets. Typically, a few projects are approved a year and most are rejected due to various restrictions.

Promotional was introduced in 2019 and currently consists of 12 sets. As of today, 40773 The Goonies The Walshes' Attic is the most valuable Promotional set with an estimated new/factory sealed value of $90.
Read more