Yoshio Sakamoto, co-creator of the Metroid series, has stated that Metroid was influenced by the 1979 sci-fi movie "Alien". This is evident when considering the following:
• Both Metroid and Alien feature a female lead protagonist.
• The Nostromo's computer is referred to as "Mother" and the antagonist of Metroid is Mother Brain.
• The Xenomorph aliens and Metroids both have multiple stages of development, and the first stage of both species latch on to other creatures.
• The boss "Ridley" is likely named after Alien's director Ridley Scott.