A karkashin umarnin da aka ba su, Nostromo ya sauka a kan tauraron kuma Kyaftin Dallas, Babban Jami'in Kane, da Navigator Lambert sun tafi don yin bincike.
Tabbas, wani nau'i mai rikitarwa na jumla shine "A karkashin umarnin da aka ba su daga masu ba su aiki,''Nostromo' ya sauka a kan planetoid kuma Kyaftin Dallas, Babban Jami'in Kane, da Navigator Lambert sun tafi don bincika da kuma gano siginar yana fitowa daga wani jirgin sama na waje wanda ba a san shi ba. "