UFO is a subtheme of Space that consists of 19 sets that ran from 1997 to 1998. Most sets were released in 1997 which accounted for 14 sets. As of today, the average annual growth of sets in Space UFO is approximately 6.6% per year.
Most valuable Space UFO set
6975 Alien Avenger $435.33
Highest growth Space UFO set
VP-5 UFO Value Pack +3447.05%
Most owned Space UFO set
6836 V-Wing Fighter
UFO was a LEGO Space subtheme released in 1996/1997 that consisted of 19 sets until it was discontinued in 1998.
19 sets

4305 Cyborg Scout

Theme / Subtheme Space / UFO
Year 1998
Pieces / Minifigs 36 / 1
Availability Retired
4305 LEGO UFO Cyborg Scout
promotional
Value $41.15
Annual growth 8.5%

3012 Space Hover

Theme / Subtheme Space / UFO
Year 1998
Pieces / Minifigs 20 / 1
Availability Retired
3012 LEGO UFO Space Hover
promotional
Value $62.70
Annual growth 3.4%

6901-2 Space Plane

Theme / Subtheme Space / UFO
Year 1998
Pieces / Minifigs 20 / 1
Availability Retired
6901-2 LEGO UFO Space Plane
Retail $1.99
Value $28.62
Growth  +1338.2%
Annual growth 6.8%

6902 Space Plane

Theme / Subtheme Space / UFO
Year 1998
Pieces / Minifigs 20 / 1
Availability Retired
6902 LEGO UFO Space Plane
Retail $1.99
Value $24.99
Growth  +1155.8%
Annual growth 6.1%

2543 Spacecraft

Theme / Subtheme Space / UFO
Year 1998
Pieces / Minifigs 18 / 1
Availability Retired
2543 LEGO UFO Spacecraft
Retail $1.99
Value $29.61
Growth  +1387.9%
Annual growth 7.3%

6975 Alien Avenger

Theme / Subtheme Space / UFO
Year 1997
Pieces / Minifigs 369 / 4
Availability Retired
6975 LEGO UFO Alien Avenger
Retail $59.99
Value $435.33
Growth  +625.7%
Annual growth 6.5%

6979 Interstellar Starfighter

Theme / Subtheme Space / UFO
Year 1997
Pieces / Minifigs 292 / 3
Availability Retired
6979 LEGO UFO Interstellar Starfighter
Retail $79.99
Value $400.08
Growth  +400.2%
Annual growth 5.9%

6915 Warp Wing Fighter

Theme / Subtheme Space / UFO
Year 1997
Pieces / Minifigs 236 / 2
Availability Retired
6915 LEGO UFO Warp Wing Fighter
Retail $29.99
Value $369.71
Growth  +1132.8%
Annual growth 4.3%

4117463 Cyber Saucer

Theme / Subtheme Space / UFO
Year 1997
Pieces 114
Availability Retired
4117463 LEGO UFO Cyber Saucer
Retail $21.99
Value $167.96
Growth  +663.8%
Annual growth 7.5%

6900 Cyber Saucer

Theme / Subtheme Space / UFO
Year 1997
Pieces / Minifigs 114 / 1
Availability Retired
6900 LEGO UFO Cyber Saucer
Retail $21.99
Value $184.12
Growth  +737.3%
Annual growth 6.9%

6999 Cyber Saucer

Theme / Subtheme Space / UFO
Year 1997
Pieces / Minifigs 114 / 1
Availability Retired
6999 LEGO UFO Cyber Saucer
Retail $19.99
Value $209.87
Growth  +949.9%
Annual growth 7.9%

VP-5 UFO Value Pack

Theme / Subtheme Space / UFO
Year 1997
Pieces 105
Availability Retired
LEGO VP-5 UFO Value Pack
Retail $9.99
Value $354.35
Growth  +3447.0%
Annual growth 13.6%

54 UFO Action Pack

Theme / Subtheme Space / UFO
Year 1997
Pieces 96
Availability Retired
54 LEGO UFO Action Pack
Retail $7.99
Value $159.54
Growth  +1896.7%
Annual growth 11.3%

6829 Radon Rover

Theme / Subtheme Space / UFO
Year 1997
Pieces / Minifigs 53 / 1
Availability Retired
6829 LEGO UFO Radon Rover
Retail $5.99
Value $63.33
Growth  +957.3%
Annual growth 8.8%

6836 V-Wing Fighter

Theme / Subtheme Space / UFO
Year 1997
Pieces / Minifigs 40 / 1
Availability Retired
6836 LEGO UFO V-Wing Fighter
Retail $3.99
Value $62.02
Growth  +1454.4%
Annual growth 8.3%

6818 Cyborg Scout

Theme / Subtheme Space / UFO
Year 1997
Pieces / Minifigs 36 / 1
Availability Retired
6818 LEGO UFO Cyborg Scout
Retail $2.99
Value $49.50
Growth  +1555.5%
Annual growth 9.0%

6800 Cyber Blaster

Theme / Subtheme Space / UFO
Year 1997
Pieces / Minifigs 20 / 1
Availability Retired
6800 LEGO UFO Cyber Blaster
Retail $1.99
Value $9.32
Growth  +368.3%
Annual growth 3.1%

6816 Cyber Blaster

Theme / Subtheme Space / UFO
Year 1997
Pieces / Minifigs 20 / 1
Availability Retired
6816 LEGO UFO Cyber Blaster
Retail $1.99
Value $32.46
Growth  +1531.2%
Annual growth 6.5%

2847 Flyer

Theme / Subtheme Space / UFO
Year 1997
Pieces / Minifigs 15 / 1
Availability Retired
2847 LEGO UFO Flyer
Retail $1.49
Value $26.00
Growth  +1645.0%
Annual growth 8.5%