Prepare for liftoff!
The ETX Alien Mothership Assault awaits!

Relive the Mars Mission era with this classic 2007 set. Featuring 434 pieces and 7 minifigs for intergalactic battles!

🏛 Mars Mission
Set #7691

ETX Alien Mothership Assault

The ETX Alien Mothership Assault is a classic Mars Mission set.

🏆 Best For: Ideal for space enthusiasts and those who appreciate classic LEGO themes. Offers a balanced build with play features. ⏱ 4.5 hr build 🧩 434 pcs
★★★☆☆ 3.7 from 9 reviews

Fans appreciate the set's classic Mars Mission theme and unique glow-in-the-dark minifigures. Some reviewers note that the building techniques are relatively simple compared to modern sets, but the overall design and play features are well-received.

📝 Our Take

The ETX Alien Mothership Assault is a classic Mars Mission set. Released in 2007, it perfectly captures the sci-fi aesthetic of the theme, pitting brave astronauts against glow-in-the-dark Martian invaders in a battle for energy crystals.

This set is perfect for LEGO space fans and collectors of classic themes. The 434 pieces provide a fun and engaging building experience, while the unique minifigures and play features make it a great addition to any collection.

Skip this if you prefer more modern building techniques or licensed themes. The Mars Mission line has a distinct, older style that may not appeal to everyone; consider newer space-themed sets like the City Space or Creator lines instead.

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Try asking:
How does this set compare to other Mars Mission sets in terms of design and playability? What are the best ways to display the ETX Alien Mothership to highlight its unique features? How rare are the glow-in-the-dark Martian minifigures, and what is their impact on the set's value? What are some creative MOCs that can be built using the parts from this set?

🧱 Building Experience

🧩
434
Pieces
4.5h
Build Time
📊
Intermediate
Difficulty
Build Highlights:
  • Modular design with detachable attack vehicles
  • Air-powered missile launching defense station
  • Use of Technic elements for play features
  • Glow-in-the-dark alien minifigures add a unique touch

📈 Investment Analysis

→ Price stable
B
Investment Grade
⏳ Active
The ETX Alien Mothership Assault (7691-1) has moderate investment potential. As a retired set from a classic LEGO theme (Mars Mission), it appeals to nostalgic collectors. The set includes a good number of pieces (434) and unique minifigures, which can drive up its value over time. However, its relatively common availability might limit significant price appreciation. Keeping the set in excellent condition with the box can enhance its investment value. Consider its long-term collectibility within the broader LEGO space theme market.

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

📖 About This Set

It's the ultimate 4-in-1 alien strike ship! With its advanced weaponry, firing missile and three detachable attack vehicles, the giant ETX Alien Mothership will stop at nothing to steal energy crystals from the Mars Mission team. Can the astronauts fight back with their defense station's launching air-powered missiles? Includes separating Alien Mothership, defense station, air pump system and 4 foam missiles that are safe for play! Includes 2 astronauts and 5 glow-in-the-dark alien minifigures! Push down on the air pump system to fire the foam missiles! Move the drill back and forth to find energy crystals! Alien Mothership has a launcher that really fires!

Compare Similar Sets

Compared to other space-themed sets, the ETX Alien Mothership stands out for its classic design and distinctive Martian minifigures. While newer sets may offer more advanced building techniques and higher piece counts, this set's unique theme and play features make it a worthwhile addition for collectors. Consider the Alien Conquest Mothership (7065-1) for a similar alien invasion theme, or the Space Police sets for a different take on LEGO space adventures.

3 Minifigures Included

The set includes five glow-in-the-dark Martian minifigures, which are highly sought after by collectors. The two astronaut minifigures add to the play value and overall appeal of the set.

📦 Full Parts Inventory - 129 unique parts • 402 total pieces

Aero Tube 32 x 3 x 2 1/3 Aero Tube 32 x 3 ...
Part #: 23221 Trans-Orange
Equipment Goblet / Glass Equipment Goblet ...
Part #: 2343 Black
Tile Special 1 x 2 Grille with Bottom Groove Tile Special 1 x ...
Part #: 2412b Orange
Tile Special 1 x 2 Grille with Bottom Groove Tile Special 1 x ...
Part #: 2412b Dark Bluish Gray
Tile 1 x 4 with Groove Tile 1 x 4 with G...
Part #: 2431 Black
Tile 1 x 4 with Groove Tile 1 x 4 with G...
Part #: 2431 Dark Bluish Gray
Tile Special 1 x 2 with Handle Tile Special 1 x ...
Part #: 2432 White
Tile Special 1 x 2 with Handle Tile Special 1 x ...
Part #: 2432 Black
Headwear Accessory Visor For Standard Helmet Headwear Accessor...
Part #: 2447 Metallic Gold
Brick 2 x 6 Brick 2 x 6
Part #: 2456 Black
Brick Special 1 x 2 with Pin Brick Special 1 x...
Part #: 2458 Dark Bluish Gray
Brick Special 1 x 2 with Pin Brick Special 1 x...
Part #: 2458 Light Bluish Gray
Plate Special 1 x 2 Side Handle [Free Ends] Plate Special 1 x...
Part #: 2540 Black
Tile Special 1 x 1 with Clip and Straight Tips Tile Special 1 x ...
Part #: 2555 Black
Brick Special 1 x 4 with Groove Brick Special 1 x...
Part #: 2653 Light Bluish Gray
Technic Pin with Friction Ridges Lengthwise and Center Slots Technic Pin with ...
Part #: 2780 Black
Lever Small Base with Black Lever Lever Small Base ...
Part #: 298c02 Blue
Brick 2 x 4 Brick 2 x 4
Part #: 3001 Black
Brick 2 x 3 Brick 2 x 3
Part #: 3002 White
Handlebars Handlebars
Part #: 30031 Black
Brick 1 x 2 Brick 1 x 2
Part #: 3004 White
Brick 1 x 1 Brick 1 x 1
Part #: 3005 Light Bluish Gray
Brick 1 x 6 Brick 1 x 6
Part #: 3009 Light Bluish Gray
Brick 1 x 4 Brick 1 x 4
Part #: 3010 White
Brick 1 x 4 Brick 1 x 4
Part #: 3010 Black
Brick Round 2 x 2 x 1 2/3 Dome Top, Blocked Open Stud Brick Round 2 x 2...
Part #: 30151a Trans-Clear
Rock 1 x 1 Jewel / Gem 24 Facet Rock 1 x 1 Jewel ...
Part #: 30153 Trans-Neon Green
Plate 2 x 4 Plate 2 x 4
Part #: 3020 Dark Bluish Gray
Plate 2 x 4 Plate 2 x 4
Part #: 3020 White
Plate 2 x 3 Plate 2 x 3
Part #: 3021 Dark Bluish Gray
Plate 2 x 2 Plate 2 x 2
Part #: 3022 10× Light Bluish Gray
Plate 1 x 2 Plate 1 x 2
Part #: 3023 Red
Plate 4 x 4 Plate 4 x 4
Part #: 3031 Dark Bluish Gray
Plate 4 x 4 Plate 4 x 4
Part #: 3031 White
Plate 2 x 8 Plate 2 x 8
Part #: 3034 Light Bluish Gray
Plate 2 x 8 Plate 2 x 8
Part #: 3034 Black
Plate 4 x 8 Plate 4 x 8
Part #: 3035 Dark Bluish Gray
Brick Round 2 x 2 x 2 Robot Body, Axle Holder 'X' Orientation Brick Round 2 x 2...
Part #: 30361b White
Hinge Brick 1 x 2 Locking with 1 Finger Vertical End Hinge Brick 1 x 2...
Part #: 30364 Dark Bluish Gray
Hinge Brick 1 x 2 Locking with 2 Fingers Vertical End, 9 Teeth Hinge Brick 1 x 2...
Part #: 30365 Black
Bar 4L (Lightsaber Blade / Wand) Bar 4L (Lightsabe...
Part #: 30374 Light Bluish Gray
Slope 45° 2 x 2 Slope 45° 2 x 2
Part #: 3039 Black
Slope 45° 2 x 2 with Radar Screen Print Slope 45° 2 x 2 w...
Part #: 3039pr0005 White
Slope 45° 2 x 1 with Bottom Pin Slope 45° 2 x 1 w...
Part #: 3040b White
Hinge Brick 1 x 2 Locking with 1 Finger Horizontal End Hinge Brick 1 x 2...
Part #: 30541 Red
Hinge Cylinder 1 x 2 Locking with 2 Click Fingers and Axle Hole, 9 Teeth Hinge Cylinder 1 ...
Part #: 30553 Black
Plate Round Corner 4 x 4 Plate Round Corne...
Part #: 30565 Lime
Launcher, Aero Tube Air Pump 16 x 14 x 13 [Complete Assembly] Launcher, Aero Tu...
Part #: 30584c01 White
Aero Tube Joiner 3 x 4 x 3 Aero Tube Joiner ...
Part #: 30585b Trans-Clear
Slope 2 x 2 No Studs, with 3 Side Pistons Raised Edges Slope 2 x 2 No St...
Part #: 30603 Black
Technic Brick 1 x 2 [2 Pin Holes] Technic Brick 1 x...
Part #: 32000 White
Technic Brick 1 x 2 [2 Pin Holes] Technic Brick 1 x...
Part #: 32000 Dark Bluish Gray
Technic Beam 1 x 11.5 Double Bent Thick Technic Beam 1 x ...
Part #: 32009 Dark Bluish Gray
Technic Axle and Pin Connector Angled #1 Technic Axle and ...
Part #: 32013 White
Technic Axle and Pin Connector Angled #3 - 157.5° Technic Axle and ...
Part #: 32016 Black
Technic Brick 1 x 14 [13 Pin Holes] Technic Brick 1 x...
Part #: 32018 Black
Technic Brick 1 x 14 [13 Pin Holes] Technic Brick 1 x...
Part #: 32018 White
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Technic Pin Long ...
Part #: 32054 Light Bluish Gray
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Technic Pin Long ...
Part #: 32054 Red
Technic Axle 2 Notched Technic Axle 2 No...
Part #: 32062 Red
Technic Brick 1 x 2 with Axle Hole Type 2 [X Opening] Technic Brick 1 x...
Part #: 32064b Green
Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Technic Bush 1/2 ...
Part #: 32123b Light Bluish Gray
Technic Plate Rotor 3 Blade with Smooth Ends and 6 Studs (Propeller) Technic Plate Rot...
Part #: 32125 Light Bluish Gray
Technic Pin Double with Axle Hole Technic Pin Doubl...
Part #: 32138 Black
Technic Beam 2 x 4 L-Shape Thick Technic Beam 2 x ...
Part #: 32140 Light Bluish Gray
Technic Beam 1 x 5 Thick Technic Beam 1 x ...
Part #: 32316 Light Bluish Gray
Technic Beam 1 x 7 Thick Technic Beam 1 x ...
Part #: 32524 Dark Bluish Gray
Technic Pin Connector Plate 1 x 2 x 1 2/3 [Two Holes On Top] Technic Pin Conne...
Part #: 32530 10× Dark Bluish Gray
Technic Brick 4 x 6 with 2 x 4 Opening Technic Brick 4 x...
Part #: 32531 Black
Slope Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Slope Inverted 45...
Part #: 3660 Light Bluish Gray
Plate 1 x 6 Plate 1 x 6
Part #: 3666 Dark Bluish Gray
Slope 65° 2 x 2 x 2 with Bottom Tube Slope 65° 2 x 2 x...
Part #: 3678b Dark Bluish Gray
Turntable 2 x 2 Plate - Top Turntable 2 x 2 P...
Part #: 3679 Light Bluish Gray
Turntable 2 x 2 Plate, Base Turntable 2 x 2 P...
Part #: 3680 Black
Technic Brick 1 x 2 [1 Pin Hole] Technic Brick 1 x...
Part #: 3700 Light Bluish Gray
Technic Brick 1 x 4 [3 Pin Holes] Technic Brick 1 x...
Part #: 3701 Black
Technic Axle 4 Technic Axle 4
Part #: 3705 Black
Technic Axle 6 Technic Axle 6
Part #: 3706 Black
Plate 1 x 4 Plate 1 x 4
Part #: 3710 White
Technic Bush Technic Bush
Part #: 3713 Light Bluish Gray
Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Plate Special 1 x...
Part #: 3794a Dark Bluish Gray
Plate 2 x 6 Plate 2 x 6
Part #: 3795 Dark Bluish Gray
Technic Brick 1 x 6 [5 Pin Holes] Technic Brick 1 x...
Part #: 3894 Black
Hinge Brick 1 x 2 Base Hinge Brick 1 x 2...
Part #: 3937 Light Bluish Gray
Brick Round 2 x 2 with Axle Hole Brick Round 2 x 2...
Part #: 3941 White
Brick Round 2 x 2 with Axle Hole Brick Round 2 x 2...
Part #: 3941 Trans-Neon Green
Antenna 1 x 4 with Rounded Top Antenna 1 x 4 wit...
Part #: 3957a Trans-Neon Green
Plate 6 x 6 Plate 6 x 6
Part #: 3958 Dark Bluish Gray
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Plate Round 2 x 2...
Part #: 4032a Dark Bluish Gray
Large Figure Weapon Spear, Drill with Axle and Hole Large Figure Weap...
Part #: 40340 Black
Animal Body Part / Plant, Tail / Neck / Branch / Trunk, Middle Section with Pin, Round Pin Hole Animal Body Part ...
Part #: 40378 Lime
Animal Body Part / Plant, Tail / Claw / Horn / Branch / Tentacle, End Section Animal Body Part ...
Part #: 40379 Lime
Brick Special 1 x 1 with Headlight Brick Special 1 x...
Part #: 4070 Black
Seat / Chair 2 x 2 Seat / Chair 2 x 2
Part #: 4079 White
Plate Special 1 x 1 with Clip Light, Bar Hole [Thick Ring] Plate Special 1 x...
Part #: 4081b Black
Tile Round 2 x 2 with Bottom Cross Tile Round 2 x 2 ...
Part #: 4150 10× Black
Rubber Band / Belt Holder 2 x 6 x 2 1/3 Rubber Band / Bel...
Part #: 41753 Dark Bluish Gray
Wedge Plate 4 x 2 Right Wedge Plate 4 x 2...
Part #: 41769 Black
Wedge Plate 4 x 2 Left Wedge Plate 4 x 2...
Part #: 41770 Black
Plate Special 2 x 2 with Grills Plate Special 2 x...
Part #: 41862 Light Bluish Gray
Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Technic Axle and ...
Part #: 42003 Black
Brick Curved 6 x 1 Brick Curved 6 x 1
Part #: 42022 Black
Wedge Curved 12 x 3 Right Wedge Curved 12 x...
Part #: 42060 White
Wedge Curved 12 x 3 Left Wedge Curved 12 x...
Part #: 42061 White
Technic Pin 1/2 Technic Pin 1/2
Part #: 4274 Light Bluish Gray
Dish 6 x 6 Inverted, Radar / Webbed [Anti-studs at 90°] Dish 6 x 6 Invert...
Part #: 4285b Trans-Neon Green
Technic Axle Pin with Friction Ridges Lengthwise Technic Axle Pin ...
Part #: 43093 Blue
Wedge Plate 4 x 4 with 2 x 2 Cutout Wedge Plate 4 x 4...
Part #: 43719 Black
Hinge Plate 1 x 2 Locking with 2 Fingers On End, with Groove, 9 Teeth Hinge Plate 1 x 2...
Part #: 44302a Black
Hinge Plate 1 x 2 Locking with 1 Finger on Side, with Groove Hinge Plate 1 x 2...
Part #: 44567a Dark Bluish Gray
Plate 1 x 10 Plate 1 x 10
Part #: 4477 Dark Bluish Gray
Hinge Tile 1 x 4 Locking Dual 1 Fingers on Top [4 Locking Ridges] Hinge Tile 1 x 4 ...
Part #: 44822 Black
Plate Special 1 x 8 with Door Rail Plate Special 1 x...
Part #: 4510 Black
Technic Axle 3 Technic Axle 3
Part #: 4519 Light Bluish Gray
Technic Axle Connector Double Flexible [Rubber] Technic Axle Conn...
Part #: 45590 Black
Cone 1 x 1 [No Top Groove] Cone 1 x 1 [No To...
Part #: 4589 Trans-Dark Blue
Cone 1 x 1 [No Top Groove] Cone 1 x 1 [No To...
Part #: 4589 Trans-Red
Cone 1 x 1 [No Top Groove] Cone 1 x 1 [No To...
Part #: 4589 Trans-Neon Green
Technic Worm Gear Technic Worm Gear
Part #: 4716 Black
Panel 1 x 2 x 1 [Square Corners] Panel 1 x 2 x 1 [...
Part #: 4865a White
Wedge Curved 10 x 3 Left Wedge Curved 10 x...
Part #: 50955 Black
Wedge Curved 10 x 3 Right Wedge Curved 10 x...
Part #: 50956 Black
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small Animal Body Part,...
Part #: 53451 Red
Projectile, Technic Competition Arrow, Liftarm Shaft with Hollow Black Rubber End Projectile, Techn...
Part #: 57028c01 Light Bluish Gray
Flexible Ribbed Hose 8mm Ends 19L Flexible Ribbed H...
Part #: 57539 Orange
Launcher, Technic Competition Cannon Flat Bottom [Complete Assembly] Launcher, Technic...
Part #: 57796 Black
Hinge Plate 1 x 12 Locking 7 Teeth with Angled Side Extensions and Tapered Ends Hinge Plate 1 x 1...
Part #: 57906 Black
Hinge Plate 1 x 12 Locking 7 Teeth with Angled Side Extensions and Tapered Ends Hinge Plate 1 x 1...
Part #: 57906 Lime
Projectile, Weapon Foam Dart with Black Tip Projectile, Weapo...
Part #: 58842 Blue
Brick Round Corner 10 x 10 with Slope 33° Edge, Axle Hole, Facet Cutout Brick Round Corne...
Part #: 58846 Black
Launcher, Weapon, Four Barrel Foam Dart Launcher Launcher, Weapon,...
Part #: 59492 Orange
Hinge Brick 2 x 2 Top Plate Thin Hinge Brick 2 x 2...
Part #: 6134 Black
Plate Round 1 x 1 with Solid Stud Plate Round 1 x 1...
Part #: 6141 Trans-Neon Green
Plate Round 1 x 1 with Solid Stud Plate Round 1 x 1...
Part #: 6141 Trans-Dark Blue
Brick Arch 1 x 4 x 2 Brick Arch 1 x 4 x 2
Part #: 6182 White
Bar 1 x 4 x 2 Bar 1 x 4 x 2
Part #: 6187 Black
Technic Axle Connector Ridged [with x Hole x Orientation] Technic Axle Conn...
Part #: 6538b Lime
Technic Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle) Technic Axle 1.5 ...
Part #: 6553 Black
Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Technic Pin Long ...
Part #: 6558 Black
Technic Axle 3 with Stud Technic Axle 3 wi...
Part #: 6587 Dark Bluish Gray
Tile 1 x 6 with Groove Tile 1 x 6 with G...
Part #: 6636 Dark Bluish Gray
Hinge Plate 1 x 4 Swivel Top / Base - Solid Clip [Complete Assembly] Hinge Plate 1 x 4...
Part #: 73983 Light Bluish Gray
Technic Pin Connector Round [No Slot] Technic Pin Conne...
Part #: 75535 Black
Technic Rubber Belt Medium [24mm ID] [Round Cross Section] Technic Rubber Be...
Part #: 85544 Bright Green
🧱 Sticker Sheet for...
Part #: 59623 [No Color/Any Color]
The set features a good selection of black and dark bluish gray pieces, useful for building space-themed MOCs. The trans-neon green elements add a distinctive alien touch to the set.

💎 Notable Parts

Trans-Neon Green Antenna 1 x 4 with Rounded Top (8x) $2.00
Lime Animal Body Part / Plant, Tail / Neck / Branch / Trunk, Middle Section with Pin, Round Pin Hole (8x) $1.60
Black Brick Special 1 x 1 with Headlight (6x) $0.90
Trans-Neon Green Rock 1 x 1 Jewel / Gem 24 Facet (6x) $2.40
Est. BrickLink Part Value
$6.90

💡 MOC Potential

🚀 Create a larger Martian base with multiple landing pads
🚢 Design a smaller, more agile alien fighter ship
🏙 Expand your LEGO City with a crashed alien mothership scene

Community Insights

Real opinions from Reddit and YouTube

What Reddit Says

No Reddit discussions found for this set.

What YouTubers Say

1 video found
BlockTalk AI

Nick on Planet Ripple appreciates the ETX Alien Mothership Assault's overall design and transparent neon green elements. However, he prefers the older Life on Mars alien minifigures to those included in this set, while praising the human minifigures' printing and design.

What the Community Says

1 YouTube reviews
BlockTalk AI Summary

Nick on Planet Ripple appreciates the ETX Alien Mothership Assault's overall design and transparent neon green elements. However, he prefers the older Life on Mars alien minifigures to those included in this set, while praising the human minifigures' printing and design.

Reddit Reviews

No Reddit reviews found

Community Content: These reviews are from Reddit and YouTube users sharing their personal experiences. Opinions may vary.

Charts Inventory Statistics

129
Unique Parts
402
Total Pieces
7
Minifigures
Inventory Version: 1