I knit the Alien with size 5 knitting needles and KnitPicks Wool of the Andes worsted weight yarn in Grass. I stared with 9 grams of yarn, and ended up with just over 1 yard remaining... too little for the scale to register! (To be fair, I did have another ball of Grass in the house so I wasn't worried about running our of yarn.)
The little Alien body looks like a cute little person. You could use this as the base for the creation of a number of different characters.
I used construction paper to make the eyes and glued them onto the Alien. So cute!