Ultra Agents Unite!
Defeat evil in the Ultrasonic Showdown!

Join Agent Curtis Bolt in this action-packed 187-piece set from 2015, featuring Professor Brainstein and high-tech gadgets!

🏛 Ultra Agents
Set #70171

Ultrasonic Showdown

Ultrasonic Showdown is a fun, action-packed set from the now-retired Ultra Agents theme.

🏆 Best For: Kids and LEGO fans who enjoy action-packed play scenarios ⏱ 1.5 hr build 🧩 187 pcs
★★★★☆ 4.1

Fans appreciate the unique minifigures and play features, especially the rapid shooters. Some find the build relatively simple, but the overall design and action-packed theme are well-received.

MSRP
$19.99
Best Price
$17.99
You Save
10% OFF
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📝 Our Take

Ultrasonic Showdown is a fun, action-packed set from the now-retired Ultra Agents theme. It perfectly captures the essence of a classic hero-versus-villain scenario with a cool vehicle for the agent and a menacing mechanical spider for the villain.

This set is perfect for kids and LEGO collectors looking for a small, playable set with unique minifigures. The build is relatively simple, making it a great choice for younger builders while still offering enough detail to appeal to older fans.

Skip this if you're looking for a complex build or a large display piece. This set is designed for play and smaller collections; consider larger Ultra Agents sets for a more substantial building experience.

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How does this set compare to other Ultra Agents sets in terms of playability? What are some creative ways to expand the Ultrasonic Showdown with other LEGO sets? Is this set a good value for the price considering the unique minifigures and parts? How should I display this set to best showcase the action features and minifigures?

🧱 Building Experience

🧩
187
Pieces
1.5h
Build Time
📊
Beginner
Difficulty
Build Highlights:
  • Simple and straightforward build
  • Incorporates play features like rapid shooters
  • Unique mechanical spider design
  • Compact and easily displayable

📈 Investment Analysis

↑ Trending up since release
B
Investment Grade
⏳ Appreciating
The Ultrasonic Showdown set, while small, benefits from being part of the Ultra Agents theme, which has a dedicated following. Its relatively low piece count and original MSRP make it an accessible entry point for collectors. The presence of unique minifigures, particularly Professor Brainstein with his mechanical spider legs, adds to its appeal. As a retired set, its value is likely to gradually increase, but its smaller size might limit significant price surges. However, the rising price trend indicates growing collector interest.

Not Financial Advice: Content is for educational purposes only. Past performance doesn't guarantee future results. Full disclaimer

Compare Similar Sets

Compared to other small LEGO sets, the Ultrasonic Showdown stands out due to its unique Ultra Agents theme and distinctive villain design. While sets like the LEGO City vehicles offer similar play experiences, this set provides a more defined hero-versus-villain scenario. For those interested in similar themes, consider other Ultra Agents sets for a more comprehensive collection.

2 Minifigures Included

The set includes Agent Curtis Bolt and the unique Professor Brainstein with Mechanical Spider Legs. Professor Brainstein is a standout figure due to his intricate design and specialized parts, making him a desirable collectible.

📦 Full Parts Inventory - 66 unique parts • 157 total pieces

Tile Round 2 x 2 with Bottom Stud Holder Tile Round 2 x 2 ...
Part #: 14769 Black
Brick Special 1 x 1 with Stud on Side and Conductive Element on Opposite Side Brick Special 1 x...
Part #: 15411 Black
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Plate Special 1 x...
Part #: 15573 Pearl Gold
Wedge Plate 4 Stud 45° Angle Plate Wedge Plate 4 Stu...
Part #: 15706 Black
Launcher Trigger, Weapon Rapid Shooter, Flat Axle Hole Launcher Trigger,...
Part #: 18587 Light Bluish Gray
Launcher, Weapon Rapid Shooter Six Barrel, 3 Fingers Launcher, Weapon ...
Part #: 18588 White
Equipment Radio [Extended Handle, Expanded Speaker Grille] Equipment Radio [...
Part #: 19220 Black
Wedge Plate 3 x 3 Cut Corner Wedge Plate 3 x 3...
Part #: 2450 Dark Bluish Gray
Plate 4 x 4 Corner Plate 4 x 4 Corner
Part #: 2639 White
Technic Pin with Friction Ridges Lengthwise and Center Slots Technic Pin with ...
Part #: 2780 Black
Brick 2 x 2 Brick 2 x 2
Part #: 3003 Dark Bluish Gray
Plate 2 x 4 Plate 2 x 4
Part #: 3020 Dark Bluish Gray
Plate 2 x 3 Plate 2 x 3
Part #: 3021 White
Plate 2 x 2 Plate 2 x 2
Part #: 3022 Dark Bluish Gray
Plate 1 x 2 Plate 1 x 2
Part #: 3023 Trans-Light Blue
Brick Special 1 x 2 with Vertical Clip [Open O Clip] Brick Special 1 x...
Part #: 30237b Black
Plate 4 x 4 Plate 4 x 4
Part #: 3031 Black
Plate 2 x 8 Plate 2 x 8
Part #: 3034 Light Bluish Gray
Wedge Plate 6 x 12 Left Wedge Plate 6 x 1...
Part #: 30355 Black
Wedge Plate 6 x 12 Right Wedge Plate 6 x 1...
Part #: 30356 Black
Slope 45° 2 x 2 Slope 45° 2 x 2
Part #: 3039 Dark Bluish Gray
Slope 45° 2 x 1 with Bottom Pin Slope 45° 2 x 1 w...
Part #: 3040b White
Slope Curved 2 x 2 with Lip, No Studs Slope Curved 2 x ...
Part #: 30602 Trans-Light Blue
Tile 1 x 2 with Groove Tile 1 x 2 with G...
Part #: 3069b Trans-Red
Plate 1 x 3 Plate 1 x 3
Part #: 3623 Dark Bluish Gray
Technic Brick 1 x 2 [1 Pin Hole] Technic Brick 1 x...
Part #: 3700 Dark Bluish Gray
Technic Brick 1 x 4 [3 Pin Holes] Technic Brick 1 x...
Part #: 3701 Dark Bluish Gray
Plate 2 x 6 Plate 2 x 6
Part #: 3795 Dark Bluish Gray
Hinge Brick 1 x 2 Base Hinge Brick 1 x 2...
Part #: 3937 Black
Brick Special 1 x 1 with Headlight Brick Special 1 x...
Part #: 4070 Blue
Technic Pin 1/2 Technic Pin 1/2
Part #: 4274 Blue
Engine, Large Engine, Large
Part #: 43121 Black
Wedge Sloped 4 x 2 Triple Left Wedge Sloped 4 x ...
Part #: 43710 Black
Wedge Sloped 4 x 2 Triple Right Wedge Sloped 4 x ...
Part #: 43711 Black
Wedge Plate 3 x 2 Right Wedge Plate 3 x 2...
Part #: 43722 White
Wedge Plate 3 x 2 Right Wedge Plate 3 x 2...
Part #: 43722 Black
Wedge Plate 3 x 2 Left Wedge Plate 3 x 2...
Part #: 43723 White
Wedge Plate 3 x 2 Left Wedge Plate 3 x 2...
Part #: 43723 Black
Brick Special 1 x 2 x 2/3 with Studs on Sides Brick Special 1 x...
Part #: 4595 Black
Dish 2 x 2 Inverted [Radar] Dish 2 x 2 Invert...
Part #: 4740 Trans-Light Blue
Brick Curved 2 x 2 x 2/3 Two Studs and Curved Slope End Brick Curved 2 x ...
Part #: 47457 Dark Bluish Gray
Wedge Curved 4 x 4 No Top Studs Wedge Curved 4 x ...
Part #: 47753 Black
Wedge Plate 8 x 3, 22° Right Wedge Plate 8 x 3...
Part #: 50304 Black
Wedge Plate 8 x 3, 22° Left Wedge Plate 8 x 3...
Part #: 50305 Black
Slope 30° 1 x 1 x 2/3 (Cheese Slope) Slope 30° 1 x 1 x...
Part #: 54200 Black
Slope 30° 1 x 1 x 2/3 (Cheese Slope) Slope 30° 1 x 1 x...
Part #: 54200 Trans-Light Blue
Technic Axle 8 with Stop Technic Axle 8 wi...
Part #: 55013 Dark Bluish Gray
Cone 1 x 1 [Top Groove] Cone 1 x 1 [Top G...
Part #: 59900 Trans-Orange
Plate Special 1 x 2 with Clips Horizontal [Open O Clips] Plate Special 1 x...
Part #: 60470b Black
Hinge Brick 2 x 2 Top Plate Thin Hinge Brick 2 x 2...
Part #: 6134 Light Bluish Gray
Slope 18° 2 x 1 x 2/3 with 4 Slots / Grate Slope 18° 2 x 1 x...
Part #: 61409 Black
Slope 18° 2 x 1 x 2/3 with 4 Slots / Grate Slope 18° 2 x 1 x...
Part #: 61409 White
Plate Round 1 x 1 with Solid Stud Plate Round 1 x 1...
Part #: 6141 25× Trans-Orange
Turntable 4 x 4 Square Base, Locking Turntable 4 x 4 S...
Part #: 61485 White
Tail Shuttle Tail Shuttle
Part #: 6239 Black
Technic Brick 1 x 1 with Pin Hole Technic Brick 1 x...
Part #: 6541 White
Tile 1 x 6 with Groove Tile 1 x 6 with G...
Part #: 6636 White
Brick Round 4 x 4 Centre Hole Brick Round 4 x 4...
Part #: 87081 Black
Plate Special 2 x 2 with Groove and Center Stud (Jumper) Plate Special 2 x...
Part #: 87580 Dark Bluish Gray
Windscreen 6 x 4 x 2 1/3 Bubble Canopy with Handle Windscreen 6 x 4 ...
Part #: 87752 Trans-Light Blue
Brick Round 2 x 2 [Grill] Brick Round 2 x 2...
Part #: 92947 Black
Bracket 1 x 2 - 2 x 4 Bracket 1 x 2 - 2...
Part #: 93274 Black
Brick Round Corner 6 x 6 with 33° Slope and Facet Cutout Brick Round Corne...
Part #: 95188 Black
Weapon Gun / Pistol Two Barrel, 10 Ribs Weapon Gun / Pist...
Part #: 95199 White
Brick Round 2 x 2 Truncated Cone Brick Round 2 x 2...
Part #: 98100 Black
Tile Round 1 x 1 Tile Round 1 x 1
Part #: 98138 Trans-Light Blue
Bracket 1 x 2 - 2 x 2 Inverted Bracket 1 x 2 - 2...
Part #: 99207 Red
Bracket 1 x 2 - 1 x 2 Inverted Bracket 1 x 2 - 1...
Part #: 99780 Black
Bracket 1 x 2 - 1 x 2 Bracket 1 x 2 - 1...
Part #: 99781 White
🧱 Sticker Sheet for...
Part #: 21670 [No Color/Any Color]
The set features a variety of translucent orange and blue elements, which are useful for adding visual flair to MOCs. The inclusion of rapid shooters also provides interesting play and building possibilities.

🛒 Where to Buy

eBay
✓ In Stock
$17.99
Walmart
✓ In Stock
$18.99
Target
✓ In Stock
$19.99
Amazon

💎 Notable Parts

Trans-Orange Plate Round 1 x 1 with Solid Stud (25x) $3.75
Trans-Light Blue Plate 1 x 2 (9x) $0.90
Black Wedge Plate 4 Stud 45° Angle Plate (4x) $0.60
White Launcher, Weapon Rapid Shooter Six Barrel, 3 Fingers (2x) $1.50
Est. BrickLink Part Value
$6.75

💡 MOC Potential

🚗 Agent vehicles, like a motorcycle or small airplane
🤖 Larger, more complex robots or mechs
🏙 Small city diorama additions

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Charts Inventory Statistics

66
Unique Parts
157
Total Pieces
2
Minifigures
Inventory Version: 1