The Batcave: The Penguin and Mr. Freeze's Invasion

Notable parts

• 3 parts come in a colour no other set has for that mould: Animal Body Part, Dinosaur / Whale Flipper with Pin (Black) ×2; Windscreen 9 x 3 x 1 2/3 Bubble Canopy (Trans-Clear) ×2; Wedge Plate 4 x 4 with 2 x 2 Cutout (Green).
• 12 parts appear in only a few other sets: Stairs Spiral Step (Light Bluish Gray) ×16 — also in 21348 Dungeons & Dragons: Red Dragon's Tale; Brick Special 12 x 12 with 3 Pin Holes on Each Side and Axle Holes in Corners (Light Bluish Gray) ×4 — also in 7782 The Batwing: The Joker's Aerial Assault (all Super Heroes DC); Large Figure Weapon Blade, Ice Skate / Ice Blade Half (Light Bluish Gray) ×4 — also in 4743 Ice Blade; Hinge Panel 2 x 4 x 3 1/3 Locking Dual 2 Fingers (Black) ×2 — also in 7721 Combat Crawler X2; Windscreen 10 x 4 x 2 Curved with Bubble Cutout and Single Hinge Finger (Black) ×2 — also in 4744 Tundra Tracker; Dish 4 x 4 Inverted [Radar] with Gold Inverse Batman Logo Print (Black) — also in 7784 The Batmobile: Ultimate Collectors' Edition (all Super Heroes DC); Weapon Sword / Katana [Octagonal Guard] (Light Bluish Gray) — also in 20017 Dagger Trap; Hair Wavy (Black) — also in 4548431, 851689 Catwoman Minifigure Magnet Set, 6167 LEGO Deluxe Brick Box; Helmet Round Bubble (Trans-Clear) — also in 8636 Deep Sea Quest, 7884 Batman's Buggy: The Escape of Mr. Freeze, 852089 Mr Freeze Minifigure Magnet Set; Rock Panel 2 x 4 x 6 with Marbled White Streak (Trans-Medium Blue) ×2 — also in 4744 Tundra Tracker, 4746 Mobile Command Centre, 7577 Winter Wonder Palace, 4748 Ogel's Mountain Fortress; Torso, Blue Arms, Black Hands [Plain] (Blue) ×2 — also in 7884 Batman's Buggy: The Escape of Mr. Freeze, 852089 Mr Freeze Minifigure Magnet Set, 3416 Women's Team, 10199 Winter Village Toy Shop; Animal, Rodent, Rat / Mouse [Plain] (Reddish Brown) — also in 4754 Hagrid's Hut, 4753 Sirius Black's Escape, 4853 Spider-Man's Street Chase, 7785 Arkham Asylum.
• 2 parts are otherwise only found in Super Heroes DC sets: Equipment Batman Accessory - Batwing (Black) ×2; Equipment Handcuffs Long [Batman] (Black).
• 7 moulds first came out in 2006, including in this set: Weapon Batarang ×3; Weapon Gun Semiautomatic Pistol ×3; Creature Body Part, Dragon Wing 8 x 10 [Plain] ×2; Equipment Handcuffs Long [Batman]; Mask, Batman Cowl [Plain]; and 2 more.
• 16 existing moulds first came out in their colour in 2006, including in this set: Stairs Spiral Step (Light Bluish Gray) ×16; Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) (Black) ×9; Wedge Plate 8 x 8 Cut Corner (Dark Bluish Gray) ×8; Brick Special 12 x 12 with 3 Pin Holes on Each Side and Axle Holes in Corners (Light Bluish Gray) ×4; Tile 8 x 16 with Bottom Tubes on Edges (Dark Bluish Gray) ×3; and 11 more.
• 2 minifigure parts with their print are only in this set: Minifig Head Alfred Pennyworth, Thin Moustache, Black Sideburns, White Pupils… (Light Nougat); Torso Suit Jacket with Gray Vest, Dark Blue Bow Tie Print, Black Arms, Light… (Black).

Calculated from Rebrickable’s public set inventories, excluding sticker sheets and spare parts.