Posted by Huwbot,
Sub Orbital Guardian
©1991 LEGO Group
Today's random set is 6878 Sub Orbital Guardian, released in 1991. It's one of 13 Space sets produced that year. It contains 69 pieces and 1 minifig, and its retail price was US$8.
It's owned by 2671 Brickset members. If you want to add it to your collection you might find it for sale at BrickLink or eBay.