LEGO ETX Alien Mothership Assault
Set #7691 · 2007 · 434 pieces · Substantial build
Set Details
- Set Number
- 7691
- Name
- ETX Alien Mothership Assault
- Theme
- Space
- Year
- 2007
- Pieces
- 434
- Complexity
- Substantial
- Build Time
- 2-4 hours
- Ages
- 10+
- Type
- Play-focused
About LEGO ETX Alien Mothership Assault
LEGO ETX Alien Mothership Assault (set #7691) is a detailed build with 434 pieces from the Space theme, released in 2007. The Space line features spacecraft, moon bases, and interstellar exploration. This is a substantial-level build suitable for ages 10+, with an estimated build time of 2-4 hours.
Set Highlights
- 434 pieces at substantial complexity — a 2-4 hours build.
- Compatible with all standard LEGO sets — bricks extend naturally into other sets you own.
- Play-focused build with interactive elements designed for 10+ builders.
Who Is This Set For?
Gift for Ages 10+
The substantial difficulty makes this accessible without being trivial — a well-matched gift for LEGO fans in the 10+ age range.
Weekend Build Project
434 pieces with an estimated 2-4 hours fits comfortably into a focused afternoon or weekend session.
Expanding a Space Collection
A solid addition for collectors building out their Space shelf. Introduces parts and builds that complement other sets from the same line.
Build Tips
A five-minute sort by color or piece type before starting saves time hunting for specific bricks mid-step.
Follow the numbered steps in sequence — structural elements early in the build support everything that comes after.
For active play sets, key connection points (hinges, turntables, clip joints) can loosen over time — a small dab of LEGO's own tube clutch lubricant on the stud resolves most looseness without damage.
Finding Instructions
Building instructions for LEGO ETX Alien Mothership Assault (#7691) are available as a free PDF on LEGO.com. You can also upload a photo of this set to LegoFinder to identify it and access the instructions directly.
ETX Alien Mothership Assault FAQ
Related Reading
More Space Sets
See all Space →
Also Released in 2007
All 2007 sets →Similar Build Difficulty
Sets at roughly the same piece count and complexity tier — different theme and year, but a similar build experience.
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