This is a LEGO Set #6940 Alien Moon Stalker. There are a few missing pieces and some substitutions. Missing pieces are shown in photos, as well as substitutions. Additionally, I had to replace some broken/missing old gray pieces with new gray pieces, so they coloring is slightly off on those pieces.
Comes with Red Spaceman and instruction book (some wear). I inventoried pieces with an online list and built the stalker and have done my best to make sure all parts are correct.