Ripley 's struggle is the plot of the main series .
Ripley is the sole survivor of an Alien rampage on the space freighter Nostromo , which leads her to a series of conflicts with the species and Weyland - Yutani .
survivor 's struggle is the plot of the main series .
Ripley is the sole survivor of an Alien rampage on the space freighter Nostromo , which leads her to a series of conflicts with the species and Weyland - Yutani .