The LEGO parts you need to build a mini 6894 Invader – Blocks magazine – the monthly LEGO magazine for fans
6894 - Back A - Back of the Box Builds
6894 Invader - Brickipedia, the LEGO Wiki
Just bought 156 little pieces of my childhood! Lego BLACKTRON Invader 6894 : r/lego
Vintage 1987 LEGO Blacktron Invader reviewed -- The original set 6894! - YouTube
Invader - LEGO set #6894-1 (Building Sets > Space > Blacktron I)
After digging through a box of gifted LEGO for hours and only one piece of the instruction booklet left, I finally completed this. 6894 Blacktron Invader : r/lego