Alien (1979) - Trading Card #66

Captain Dallas, convinced that the Alien is using Nostormo's air shafts to move around in, crawls into one of the vents in an attempt to drive the Monster out. Dallas' disappearance chills the blood of his crew-mates... 

Another out of sequence image used for this plot summary. This looks to be from when the Nostromo is either landing on, or taking off of, the inhospitable planetoid upon which the alien craft had crash-landed.