BlockTalk Find Your Set

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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.

Alienator

Checking

6876 Alienator

86 pieces in 46 part and color combinations, plus 1 minifigure.

The piece count includes the 6 parts inside the set's minifigures, which this inventory lists separately. 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 61 pieces

  • Brick 1 x 2 Black Part 3004 Element 300426 ×1
  • Brick 2 x 2 Black Part 3003 Element 4103587 or 300326 ×1
  • Brick Round 1 x 1 Open Stud Black Part 3062b Element 306226 ×2
  • Brick Round 1 x 1 with Fins, Open Stud Black Part 4588 Element 6039178 or 4246931 ×2
  • Brick Round 2 x 2 with Axle Hole Black Part 3941 Element 614376 or 614326 ×2
  • Brick Sloped 45° 2 x 1 with Bottom Pin Black Part 3040b Element 4121966 or 304026 ×2
  • Brick Sloped 45° 2 x 2 Black Part 3039 Element 303926 ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Black Part 3660 Element 366026 ×1
  • Brick Sloped Inverted 45° 4 x 2 Double with 2 x 2 Recessed Black Part 4871 Element 4188534 or 487126 ×1
  • Brick Special 1 x 2 x 2/3 with Studs on Sides Black Part 4595 Element 6681661 or 4523339 ×2
  • Brick Special 2 x 2 with Pin and No Axle Hole Black Part 4730 Element 473026 ×2
  • Hinge Bar with 3 Fingers and End Stud (Control Lever) Black Part 2433 Element 4497182 or 243326 ×2
  • Hinge Brick 1 x 2 Base Black Part 3937 Element 393726 ×1
  • Hinge Brick 1 x 2 Top Plate Thin Black Part 3938 Element 393826 ×1
  • Hinge Plate 1 x 2 with 2 Fingers and Hollow Studs Black Part 4276b Element 4264363 or 4256402 ×2
  • Hinge Plate 1 x 2 with 3 Fingers [Hollow Studs] Black Part 4275b Element 427526 ×2
  • Hinge Tile 1 x 2 1/2 with 2 Fingers on Top Black Part 4531 Element 453126 ×2
  • Lever Small Base with Yellow Lever Black Part 298c01 Element 74138 ×2
  • Panel 3 x 3 x 6 Corner Wall Black Part 2345 Element 4272943 or 4160950 ×2
  • Plate 1 x 1 Black Part 3024 Element 302426 ×2
  • Plate 1 x 2 Black Part 3023 Element 302326 ×1
  • Plate 2 x 10 Black Part 3832 Element 383226 ×1
  • Plate 2 x 3 Black Part 3021 Element 302126 ×1
  • Plate 2 x 4 Black Part 3020 Element 302026 ×1
  • Plate 2 x 6 Black Part 3795 Element 379526 ×1
  • Plate 2 x 8 Black Part 3034 Element 303426 ×3
  • Plate 4 x 8 Black Part 3035 Element 303526 ×1
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Black Part 4032a Element 403226 ×1
  • Plate Special 1 x 1 with Clip Vertical [Thin U Clip] Black Part 4085b ×4
  • Plate Special 1 x 2 with Handles [Flat Ends / Low Attachment] Black Part 3839b Element 383926 ×1
  • Plate Special 1 x 4 Offset with Bar Holes Black Part 4590 Element 6002559 or 4278029 ×2
  • Support Round 2 x 2 x 2 Stand with Reach-Through Center Hole Black Part 3940b Element 394026 ×4
  • Technic Brick 1 x 4 [3 Pin Holes] Black Part 3701 Element 370126 ×1
  • Tile 1 x 2 with Groove Black Part 3069b Element 306926 ×3
  • Wedge Plate 8 x 4 Wing Right without Stud Notch Black Part 3934a ×1
  • Wedge, Plate 8 x 4 Wing Left without Underside Stud Notch Black Part 3933a ×1

Yellow 14 pieces

  • Antenna 1 x 4 with Rounded Top Yellow Part 3957a Element 4497183 or 395724 ×2
  • Bar 1 x 3 [Clip / Anti-Stud] Yellow Part 4735 Element 4108114 or 473574 ×1
  • Plate 1 x 2 Yellow Part 3023 Element 302324 ×2
  • Plate Round 1 x 1 with Solid Stud Yellow Part 6141 Element 614124 ×2
  • Turntable 2 x 2 Plate, Base Yellow Part 3680 Element 4667211 or 4597261 ×6
  • Weapon Gun / Torch (Space) [with Grooves] Yellow Part 3959 Element 4254958 or 4238558 ×1

Light Gray 6 pieces

  • Turntable 2 x 2 Plate - Top Light Gray Part 3679 Element 367952 or 367902 ×6

Trans-Red 4 pieces

  • Dish 2 x 2 Inverted [Radar] Trans-Red Part 4740 Element 6580377 or 6245303 ×2
  • Plate Round 1 x 1 with Solid Stud Trans-Red Part 6141 Element 6514051 or 6208450 ×2

Trans-Yellow 1 piece

  • Panel 3 x 2 x 6 Trans-Yellow Part 2466 ×1

Minifigures 1 figure

  • Blacktron I (3626a Head) 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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