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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.

Dr. Wu's Lab: Baby Dinosaurs Breakout

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75939 Dr. Wu's Lab: Baby Dinosaurs Breakout

156 pieces in 93 part and color combinations, plus 2 minifigures.

The official piece count includes the 8 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

Light Bluish Gray 55 pieces

  • Arm Mechanical with 2 Clips [Battle Droid] Light Bluish Gray Part 30377 Element 6319333 or 4211658 1 spare in the box ×2
  • Bracket 5 x 2 x 1 1/3 with Holes, Pin Bottom Light Bluish Gray Part 11215 Element 6028811 ×1
  • Brick 1 x 1 x 3 Light Bluish Gray Part 14716 Element 6061702 ×2
  • Brick 2 x 2 Light Bluish Gray Part 3003 Element 4211387 ×1
  • Brick Curved Inverted 2 x 1 Light Bluish Gray Part 24201 Element 6144138 ×1
  • Brick Curved Inverted 2 x 2 x 2/3 Light Bluish Gray Part 32803 Element 6185676 ×1
  • Brick Sloped 33° 3 x 1 Light Bluish Gray Part 4286 Element 4211488 ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Light Bluish Gray Part 3660 Element 4211436 ×6
  • Brick Special 1 x 2 with Handle Light Bluish Gray Part 30236 Element 4211580 ×1
  • Brick Special 1 x 2 with Vertical Clip [Open O Clip] Light Bluish Gray Part 30237b Element 6320297 or 4641682 ×4
  • Brick Special 1 x 4 with 4 Studs on One Side Light Bluish Gray Part 30414 Element 4211636 ×1
  • Hinge Brick 1 x 2 Base Light Bluish Gray Part 3937 Element 4211469 ×2
  • Plate 1 x 2 Light Bluish Gray Part 3023 Element 4211398 or 3023194 ×2
  • Plate 1 x 3 Light Bluish Gray Part 3623 Element 4211429 or 3623194 ×5
  • Plate 2 x 2 Light Bluish Gray Part 3022 Element 4211397 ×3
  • Plate 2 x 2 Corner Light Bluish Gray Part 2420 Element 4211353 ×2
  • Plate 2 x 6 Light Bluish Gray Part 3795 Element 4211452 or 3795194 ×1
  • Plate 3 x 3 Light Bluish Gray Part 11212 Element 6015347 ×2
  • Plate Round Corner 3 x 3 Light Bluish Gray Part 30357 Element 4645412 or 4211756 ×1
  • Plate Special 1 x 1 Rounded with Handle Light Bluish Gray Part 26047 Element 6225246 ×2
  • Plate Special 1 x 1 with Clip Light, Bar Hole [Thick Ring] Light Bluish Gray Part 4081b Element 6281998 or 4632575 ×1
  • Plate Special 1 x 2, Top Clip [Split] Light Bluish Gray Part 92280 Element 4598526 ×2
  • Technic Axle and Pin Connector Angled #1 Light Bluish Gray Part 32013 Element 6296859 or 4211550 ×1
  • Technic Pin Connector Perpendicular 2 x 2 Bent Light Bluish Gray Part 44809 Element 4211880 ×1
  • Tile 1 x 4 with Groove Light Bluish Gray Part 2431 Element 4211356 or 2431194 ×2
  • Tile Round 1 x 1 Quarter Light Bluish Gray Part 25269 Element 6176433 1 spare in the box ×2
  • Tile Special 1 x 1 with Clip with Rounded Edges Light Bluish Gray Part 15712 Element 6308012 or 6071229 ×2
  • Tile Special 2 x 2 with Top Pin [Squared Holes] Light Bluish Gray Part 49153 Element 6313188 ×2

Dark Blue 27 pieces

  • Brick 1 x 1 Dark Blue Part 3005 Element 6554189 or 4255413 ×1
  • Brick 1 x 2 Dark Blue Part 3004 Element 4249891 ×2
  • Brick 1 x 6 Dark Blue Part 3009 Element 6554211 or 6221672 ×1
  • Brick 2 x 2 Dark Blue Part 3003 Element 4296785 or 4264580 ×5
  • Brick 2 x 6 Dark Blue Part 2456 Element 6100239 or 4649967 ×1
  • Brick Curved 2 x 2 x 2/3 Dark Blue Part 15068 Element 6554196 or 6061569 ×3
  • Brick Curved 4 x 1 Double, No Studs Dark Blue Part 93273 Element 6037886 ×2
  • Brick Sloped 45° 2 x 1 with Bottom Pin Dark Blue Part 3040b Element 6103405 or 4615996 ×2
  • Plate 1 x 1 Dark Blue Part 3024 Element 6554188 or 4184108 1 spare in the box ×6
  • Plate 2 x 8 Dark Blue Part 3034 Element 6027627 or 4530027 ×1
  • Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Dark Blue Part 15573 Element 6554197 or 6092588 ×3

Black 15 pieces

  • Equipment Laptop Black Part 62698 Element 6087083 or 4527063 ×1
  • Hinge Brick 1 x 4 [Lower] Black Part 3831 Element 383126 ×1
  • Hinge Brick 1 x 4 [Upper] Black Part 3830 Element 6344999 or 6011458 ×1
  • Hinge Brick 2 x 2 Top Plate Thin Black Part 6134 Element 4124096 or 613426 ×2
  • Lever Small Base with Black Lever Black Part 298c02 Element 73587 1 spare in the box ×2
  • Plate Special 1 x 2 Side Handle [Free Ends] Black Part 2540 Element 4140588 or 254026 ×1
  • Plate Special 3 x 4 with 1 x 4 Center Studs [Plain] Black Part 88646 Element 6076678 or 4571146 ×1
  • Plate Special 4 x 6, Studs on 3 Edges Black Part 6180 Element 4100378 or 618026 ×1
  • Technic Beam 3 x 3 L-Shape Thin Black Part 32056 Element 6271810 or 4112287 ×1
  • Technic Pin with Friction Ridges Lengthwise with No Center Slots Black Part 61332 Element 6279875 1 spare in the box ×2
  • Tile 2 x 4 with Groove Black Part 87079 Element 4560182 ×2

White 14 pieces

  • Brick 1 x 2 x 2 with Inside Stud Holder White Part 3245c Element 6550139 or 4113261 ×1
  • Brick Sloped 33° 3 x 4 White Part 3297 Element 329701 ×1
  • Brick Sloped 75° 2 x 2 x 3 [Solid Studs] White Part 98560 Element 6552137 or 6004491 ×1
  • Food Egg with 1.5mm Hole [Plain] White Part 24946 Element 6550158 or 6143595 ×2
  • Plate 2 x 10 White Part 3832 Element 6552109 or 383201 ×1
  • Plate 2 x 4 White Part 3020 Element 6552098 or 302001 ×2
  • Plate 4 x 12 White Part 3029 Element 4168072 or 302901 ×1
  • Plate 8 x 8 with Rounded End White Part 41948 Element 6249095 ×1
  • Technic Brick 1 x 2 [2 Pin Holes] White Part 32000 Element 6564911 or 3200001 ×1
  • Tile 2 x 4 with Groove White Part 87079 Element 6548271 or 4560178 ×2
  • Wheel 31 x 15 Technic, 7 Pin Holes White Part 60208 Element 6524592 or 4512751 ×1

Dark Bluish Gray 13 pieces

  • Bracket 1 x 1 - 1 x 1 Inverted Dark Bluish Gray Part 36840 Element 6225494 ×1
  • Brick Sloped 45° 2 x 1 with 2/3 Inverted Cutout and no stud Dark Bluish Gray Part 28192 Element 6168776 ×2
  • Equipment Binoculars Dark Bluish Gray Part 30162 Element 4587887 or 4211051 ×1
  • Plate Special 1 x 2 with Pin Hole on Top Dark Bluish Gray Part 11458 Element 6019987 ×2
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Dark Bluish Gray Part 87580 Element 6126083 or 4565322 ×4
  • Tile 1 x 6 with Groove Dark Bluish Gray Part 6636 Element 4210651 ×2
  • Weapon Gun Automatic Pistol with Top Clip Dark Bluish Gray Part 15445 Element 6191976 or 6055607 ×1

Trans-Light Blue 5 pieces

  • Panel 1 x 2 x 1 with Rounded Corners and 2 Sides Trans-Light Blue Part 23969 Element 6507955 or 6248908 ×2
  • Panel 1 x 6 x 5 Trans-Light Blue Part 59349 Element 6514107 or 6245257 ×1
  • Windscreen 1 x 6 x 3 Trans-Light Blue Part 64453 Element 6580414 or 6514292 ×1
  • Windscreen 4 x 4 x 1 2/3 Canopy Half Sphere with Handle Trans-Light Blue Part 18990 Element 6514148 or 6268646 ×1

Blue 3 pieces

  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×1
  • Technic Pin 1/2 without Friction Ridges Blue Part 4274 Element 4143005 1 spare in the box ×2

Bright Green 3 pieces

  • Plant, Plate 1 x 1 Round with 3 Leaves Bright Green Part 32607 Element 6182261 1 spare in the box ×3

Olive Green 3 pieces

  • Animal, Dinosaur, Triceratops, Baby, Tan Underside, Olive Green Spots Print Olive Green Part 68081pr0002 Element 6302162 ×1
  • Brick 1 x 2 Olive Green Part 3004 Element 6031131 or 6024722 ×1
  • Plate 1 x 2 Olive Green Part 3023 Element 6016483 ×1

Flat Silver 2 pieces

  • Tile Special 1 x 2 Grille with Bottom Groove Flat Silver Part 2412b Element 4619636 ×2

Green 2 pieces

  • Plate 1 x 1 Green Part 3024 Element 302428 1 spare in the box ×2

Lime 2 pieces

  • Equipment Medical Syringe with 2 Holes Lime Part 53020 Element 6361951 or 6263458 1 spare in the box ×2

Yellow 2 pieces

  • Equipment Cup / Mug [Plain] Yellow Part 3899 Element 389924 ×1
  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Yellow Part 32123b Element 6271167 or 3212324 1 spare in the box ×1

Light Aqua 1 piece

  • Equipment Baby Bottle with Handle Light Aqua Part 18855 Element 6412881 or 6102882 ×1

Pearl Gold 1 piece

  • Tap 1 x 2 with Dual Handles, Small Pearl Gold Part 13770 Element 6245261 or 6170417 ×1

Reddish Brown 1 piece

  • Plate 3 x 3 Cross Reddish Brown Part 15397 Element 6050918 ×1

Sand Green 1 piece

  • Animal, Dinosaur, Ankylosaurus, Baby with Tan Spikes and Legs, Sand Green Eyes Print Sand Green Part 67443pr0002 Element 6302089 ×1

Tan 1 piece

  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×1

Trans-Clear 1 piece

  • Tile Round 1 x 1 Trans-Clear Part 98138 Element 6514191 or 6274738 1 spare in the box ×1

Trans-Green 1 piece

  • Plate Round 1 x 1 with Solid Stud Trans-Green Part 6141 Element 6514057 or 6240221 1 spare in the box ×1

Trans-Orange 1 piece

  • Brick 1 x 1 with Mosquito Print Trans-Orange Part 3005pr0024 Element 6532485 or 6308322 ×1

Trans-Red 1 piece

  • Plate Round 1 x 1 with Solid Stud Trans-Red Part 6141 Element 6514051 or 6208450 1 spare in the box ×1

[No Color/Any Color] 1 piece

  • Sticker Sheet for Set 75939-1 [No Color/Any Color] Part 68068 Element 6302090 ×1

Minifigures 2 figures

  • Dr. Henry Wu, Scared Minifigure, checked as a whole figure ×1
  • Owen Grady with Strap with Canisters, Dark Blue Legs 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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