Alien the 8th Passenger on Instagram: "How does a chestburster grow? For many years, the transition from Chestburster to adult Xenomorph remained hidden. In Alien 3, we saw for the first time a Chestburster born with fully developed limbs, giving it a more animalistic look. Later, in Alien: Covenant, the Chestburster appeared already in its adult form, only smaller in size. Alien: Romulus introduced an intriguing version, where a cocoon forms to allow the creature to grow until reaching its fina