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LEGO Missing Piece Checker

Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece and leave with the element ID LEGO asks for, or a link to buy the part.

Alien Avenger

Checking

6975 Alien Avenger

353 pieces in 115 part and color combinations, plus 4 minifigures.

LEGO counts 369 pieces. This inventory comes from a separate parts catalog and lists 371, including the 18 parts inside the minifigures; the two do not always count the same elements, so their totals differ. Spare parts are counted in neither figure.

Before you call it missing

Builders who report a missing piece often find it in one of these places. Tick each one off as you look.

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Piece checklist

Black 150 pieces

  • Arm Holder Brick 1 x 2 with 2 Horizontal Fingers Black Part 30014 Element 3001426 ×1
  • Arm Piece Straight with 2 and 3 Fingers Black Part 3612 Element 610126 ×8
  • Box 2 x 2 x 2 [Hollow Studs] Black Part 4345b Element 6138634 or 4143247 ×2
  • Brick 1 x 4 Black Part 3010 Element 301026 ×4
  • Brick 1 x 8 Black Part 3008 Element 300826 ×2
  • Brick 2 x 2 Black Part 3003 Element 4103587 or 300326 ×4
  • Brick 2 x 2 Corner Black Part 2357 Element 235776 or 235726 ×4
  • Brick 2 x 3 Black Part 3002 Element 300226 ×2
  • Brick Sloped 75° 2 x 1 x 3 with Open Stud Black Part 4460a ×4
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Black Part 3660 Element 366026 ×2
  • Brick Special 1 x 2 with Grille Black Part 2877 Element 287726 ×1
  • Brick Special 1 x 2 x 2/3 with Studs on Sides Black Part 4595 Element 6681661 or 4523339 ×1
  • Dish 4 x 4 Inverted [Radar] Black Part 3960 Element 396026 ×1
  • Engine - Smooth, Small 1 x 2 Side Plate [With Axle Holders] Black Part 3475b Element 347526 ×2
  • Engine, Strakes, 2 x 2 Thin Top Plate Black Part 4229 Element 4552040 or 4163480 ×8
  • Equipment Space Scanner Black Part 30035 Element 4248831 or 4143705 ×1
  • Hinge Brick 1 x 2 Base Black Part 3937 Element 393726 ×3
  • Hinge Vehicle Roof Holder 1 x 4 Black Part 4315 Element 4250225 or 431576 ×4
  • Magnet Cylindrical Black Part 73092 Element 73092 ×6
  • Magnet Holder 2 x 3 Black Part 2607 Element 260726 ×3
  • Magnet Holder Tile 2 x 2 - Tall Arms with Deep Notch Black Part 2609b Element 4502266 or 4163970 ×3
  • Panel 3 x 5 Solar / Deltoid with Clip [Hexagonal] Black Part 30034 Element 4107112 ×2
  • Plate 1 x 2 Black Part 3023 Element 302326 ×5
  • Plate 1 x 4 Black Part 3710 Element 371026 ×4
  • Plate 1 x 6 Black Part 3666 Element 366626 ×4
  • Plate 1 x 8 Black Part 3460 Element 346026 ×4
  • Plate 2 x 10 Black Part 3832 Element 383226 ×1
  • Plate 2 x 2 Black Part 3022 Element 302226 ×3
  • Plate 2 x 3 Black Part 3021 Element 302126 ×7
  • Plate 2 x 4 Black Part 3020 Element 302026 ×1
  • Plate 2 x 6 Black Part 3795 Element 379526 ×2
  • Plate 2 x 8 Black Part 3034 Element 303426 ×1
  • Plate 4 x 12 Black Part 3029 Element 302926 ×4
  • Plate Special 1 x 2 Side Handle [Free Ends] Black Part 2540 Element 4140588 or 254026 ×2
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Black Part 3794a ×8
  • Plate Special 1 x 4 Offset with Bar Holes Black Part 4590 Element 6002559 or 4278029 ×3
  • Plate Special 10 x 10 Octagonal Opening Black Part 6063 Element 4107535 ×1
  • Plate Special 2 x 2 with Wheel Holders Black Part 4600 Element 460026 ×2
  • Plate Special 6 x 6 Octagonal with Opening Black Part 30062 Element 4107107 ×1
  • Plate Special 8 x 8 with Grille [No Hole in Center] Black Part 4151a ×1
  • Tile 1 x 2 with Arrow Short Red with Silver Border Print Black Part 3069bpr0037 Element 81799 ×2
  • Tile 1 x 2 with Yellow and Orange Display Print Black Part 3069bpr0042 Element 4221986 or 4107120 ×2
  • Tile Round 2 x 2 with Bottom Cross Black Part 4150 Element 415076 or 415026 ×2
  • Tile Special 1 x 2 Grille with Bottom Groove Black Part 2412b Element 241226 ×3
  • Tile Special 1 x 2 with Handle Black Part 2432 Element 243226 ×1
  • Turntable 2 x 2 Plate, Base Black Part 3680 Element 368076 or 368026 ×2
  • Turntable 4 x 4 Square Base with Top, Complete Assembly Black Part 3403c01 Element 4221663 or 4143677 ×2
  • Tyre 15 x 6 Offset Tread Small Black Part 3641 Element 4501046 or 364126 ×4
  • Wedge Plate 3 x 3 Cut Corner Black Part 2450 Element 4227684 or 245026 ×4
  • Wedge Plate 3 x 6 Cut Corners Black Part 2419 Element 241926 ×2
  • Wheel Hard Plastic Small (22mm D. x 24mm) Black Part 6118 Element 4106928 or 611876 ×4

Light Gray 80 pieces

  • Brick 2 x 4 Light Gray Part 3001 Element 4116259 or 300102 ×5
  • Brick Round 4 x 4 with 4 Side Pin Holes and Center Axle Hole Light Gray Part 6222 Element 622202 ×2
  • Brick Sloped 33° 3 x 2 Light Gray Part 3298 Element 329802 ×3
  • Brick Sloped 33° 3 x 2 with UFO Print Light Gray Part 3298pr0025 Element 4107117 ×1
  • Brick Sloped 33° 3 x 4 Light Gray Part 3297 Element 329702 ×2
  • Brick Sloped 45° 2 x 2 Light Gray Part 3039 Element 303902 ×8
  • Brick Sloped 45° 2 x 4 Light Gray Part 3037 Element 303702 ×1
  • Brick Special 1 x 1 with 3 Speakers / Loudspeakers / Space Positioning Rockets Light Gray Part 3963 Element 396302 ×2
  • Brick Special 1 x 2 with Pin Light Gray Part 2458 Element 245802 ×2
  • Dish 2 x 2 Inverted [Radar] Light Gray Part 4740 Element 474002 ×2
  • Hinge Vehicle Roof 4 x 4 Light Gray Part 4213 Element 4256455 or 421302 ×2
  • Panel 10 x 10 x 2 1/3 Quarter Saucer Top with UFO Print Left Light Gray Part 30117pr0001 Element 4112967 ×1
  • Panel 10 x 10 x 2 1/3 Quarter Saucer Top with UFO Print Right Light Gray Part 30117pr0009 Element 4112966 ×1
  • Panel 14 x 14 x 2.667 Quarter Saucer with Left UFO Print Light Gray Part 30116pr0001 Element 4112969 ×2
  • Panel 14 x 14 x 2.667 Quarter Saucer with Right UFO Print Light Gray Part 30116pr0002 Element 4112968 ×2
  • Plate 1 x 2 Light Gray Part 3023 Element 302302 ×2
  • Plate 1 x 4 Light Gray Part 3710 Element 371002 ×2
  • Plate 2 x 2 Light Gray Part 3022 Element 302202 ×4
  • Plate 2 x 4 Light Gray Part 3020 Element 302002 ×2
  • Plate 4 x 4 Corner Light Gray Part 2639 Element 4189309 or 263902 ×8
  • Plate 4 x 8 Light Gray Part 3035 Element 303502 ×4
  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Light Gray Part 2654 Element 265402 ×1
  • Seat / Chair 2 x 2 Light Gray Part 4079 Element 407902 ×1
  • Tile 1 x 2 with UFO Controls Print Light Gray Part 3069bpr0045 Element 4107119 ×3
  • Tile 2 x 2 with Orange UFO Print Light Gray Part 3068bpr0063 Element 4107118 ×4
  • Turntable 2 x 2 Plate - Top Light Gray Part 3679 Element 367952 or 367902 ×2
  • Wedge Plate 3 x 6 Cut Corners Light Gray Part 2419 Element 241902 ×1
  • Wedge Plate 4 x 4 Wing Left Light Gray Part 3936 Element 4248128 or 4248125 ×1
  • Wedge Plate 4 x 4 Wing Right Light Gray Part 3935 Element 4248118 or 393502 ×1
  • Wedge Plate 6 x 6 Cut Corner Light Gray Part 6106 Element 610602 ×4
  • Wheel 8 x 6 Light Gray Part 4624 Element 462402 ×4

Red 59 pieces

  • Bracket 1 x 2 - 1 x 4 [Square Corners] Red Part 2436 Element 4282742 or 243621 ×2
  • Brick 1 x 2 Red Part 3004 Element 4613961 or 300421 ×12
  • Brick 2 x 2 Corner Red Part 2357 Element 235771 or 235721 ×4
  • Brick 2 x 3 Red Part 3002 Element 300271 or 300221 ×2
  • Hinge Brick 1 x 2 Top Plate Thin Red Part 3938 Element 6534944 or 6078079 ×2
  • Plate 1 x 2 Red Part 3023 Element 302321 ×6
  • Plate 1 x 4 Red Part 3710 Element 371021 ×1
  • Plate 1 x 6 Red Part 3666 Element 366621 ×2
  • Plate 2 x 2 Red Part 3022 Element 4613974 or 302221 ×9
  • Plate 2 x 2 Corner Red Part 2420 Element 242071 or 242021 ×8
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Red Part 4032a Element 403221 ×8
  • Tile Special 1 x 2 Grille with Bottom Groove Red Part 2412b Element 241221 ×3

Trans-Neon Green 40 pieces

  • Antenna 8H Whip Trans-Neon Green Part 2569 Element 6265159 or 6164380 ×2
  • Box 2 x 2 x 2 Door with Slot Trans-Neon Green Part 4346 Element 4107105 ×2
  • Cone 1 x 1 [No Top Groove] Trans-Neon Green Part 4589 Element 618849 or 458949 ×16
  • Dish 2 x 2 Inverted [Radar] Trans-Neon Green Part 4740 Element 6245297 or 4112517 ×4
  • Panel 10 x 10 x 2 1/3 Quarter Saucer Top Trans-Neon Green Part 30117 Element 4112960 or 4106989 ×2
  • Plate 1 x 2 Trans-Neon Green Part 3023 Element 6240224 or 6102038 ×2
  • Plate Round 1 x 1 with Solid Stud Trans-Neon Green Part 6141 Element 6240223 or 3005749 1 spare in the box ×9
  • Windscreen 6 x 4 x 2 Canopy Trans-Neon Green Part 4474 Element 4107536 ×2
  • Windscreen 6 x 6 Octagonal Canopy with Axle hole Trans-Neon Green Part 2418b Element 4107181 ×1

Blue 18 pieces

  • Arm Piece with Pin, 3 Fingers Blue Part 6217 Element 604723 ×1
  • Brick 1 x 2 Blue Part 3004 Element 4613959 or 300423 ×1
  • Brick 2 x 2 Blue Part 3003 Element 4103589 or 300373 ×1
  • Plate 1 x 2 Blue Part 3023 Element 302323 ×2
  • Plate 2 x 3 Blue Part 3021 Element 302123 ×1
  • Plate 2 x 4 Blue Part 3020 Element 4240375 or 302023 ×2
  • Plate Round 1 x 1 with Solid Stud Blue Part 6141 Element 614123 1 spare in the box ×8
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Blue Part 3794a ×2

[No Color/Any Color] 3 pieces

  • Sticker Sheet for Sets 2154-1, 5129-1, 5384-1, 6856-1, 6900-1, 6915-1, 6958-1, 6975-1, 6982-1, 6999-1 [No Color/Any Color] Part 170909 Element 170909 ×1
  • Sticker Sheet for Sets 5384-1, 6900-1, 6915-1, 6975-1, 6979-1, 6999-1 [No Color/Any Color] Part 71442 Element 4106993 ×2

Dark Gray 2 pieces

  • Brick Special 2 x 2 with 2 Pins and Axle Hole Dark Gray Part 30000 Element 3000027 ×2

Trans-Neon Orange 1 piece

  • Arm Piece 90° Turn [2 / 3 Fingers] Trans-Neon Orange Part 412 Element 3001547 ×1

Minifigures 4 figures

  • UFO Alien, Blue Minifigure, checked as a whole figure ×1
  • UFO Alien, Red Minifigure, checked as a whole figure ×1
  • UFO Droid, Blue Minifigure, checked as a whole figure ×1
  • UFO Alien, Gray Overlord Minifigure, checked as a whole figure ×1

Tick each piece as you find it, or mark it missing.

When a piece really is missing

Ask LEGO

LEGO takes requests for pieces missing from a new set through its customer service site. The form asks for the set number and each piece's element ID, the number printed beside the piece in the parts list at the back of the instructions. This checker lists both.

Request a replacement from LEGO

Buy the piece

Mark a piece missing and your list links it to an eBay search for that part, which also covers pieces from older or second-hand sets.

Keep a record

Copy or download your missing list (the CSV opens in any spreadsheet), or print the whole checklist and tick pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.

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