The Newborn, was a human-Xenomorph hybrid that was birthed by the Cloned Queen. The Newborn emerged as a byproduct of cloning experiments conducted by scientists of the United Systems Military. Doctors Mason Wren, Gediman, and others used the alien-corrupted DNA samples of Ellen Ripley in an attempt to produce a Xenomorph Queen.
After seven unsuccessful attempts to differentiate Ellen Ripley's DNA from the developing queen's, a fully formed Queen chestburster was removed from the eighth (and to all appearances) fully human Ripley clone. Once removed, the Queen continued her normal cycle of laying eggs. Upon her reunion with Ripley 8 (now exhibiting Xenomorph traits) the Queen had moved past the egg laying stage and developed a massive womb, Ripley's genetic "gift", according to the maddened Dr. Gediman. The Newborn emerges from the womb, the Queen's first live birth.
After emerging from the Queen's womb, a cocooned Dr. Gediman described it as a "beautiful, beautiful butterfly", showing his personal affection for the beast. The Newborn proceeded to talk to the queen through low growls. As sudden as it was surprising, the newborn decapitated the Queen (to the horror and confusion of Dr. Gediman). It then went over to Ripley 8 and slowly licked her in affection; Gediman, ever the informational support, told Ripley that the Newborn had apparently imprinted on her as its mother instead of the Queen. When the Newborn heard him speak, it went over to the insane doctor and tears open the top of his skull with its jaws, likely having just noticed him.
On Board the Betty & Death
When Annalee Call went to close the back of the Betty, she was attacked by the Newborn. She escaped the reach of the creature by slipping into the safety of a crevice. Eventually, Officer DiStephano moved back to figure out what was going on, only to have his skull broken open by the Newborn. After Vriess's unanswered calls to DiStephano, Ripley sensed that something was wrong and moved back to the cargo area as well, discovering the Newborn holding onto Call. Ripley, utilizing the Newborn's imprintation onto her to her advantage, commands it to put Call down. She then moves over to the creature, embracing it as her offspring.
However, she is using this event to her advantage as well - she purposefully cuts her hand on one of the Newborn's fangs and flings a trace amount of her blood against the nearest window. As she is a Xenomorphic hybrid, her acidic blood corroded through the window, causing a lack of equalized pressure and dragging everything to the tiny hole leading out to space. Ripley and Call grab onto some straps in order to keep from being sucked towards the hole herself, while Newborn smashes up against the window.
Before long, the Newborn's internal organs were ruptured and eventually the entirety of its form is sucked out the window piece by piece, slowly and excruciatingly killing it. While it is being sucked through the hole in the glass it was reportedly heard screaming the word "Mama" at Ripley 8.
During its demise, Ripley expressed remorse, and informs it that she is sorry for the inevitable outcome. Unmistakably it was looking at her with the deepest sadness for her turning on it.
This breed of Xenomorph was the resulting offspring which emerged from the womb. It had a softer skin rather than the chitinous exoskeleton of the other breeds. It also had more Human proportions as well as a slightly Human face with eyes deep in the sockets as well as feral fangs. It also had no sign of a tail, which had likely shrank to the vestigial length of a coccyx. This is the one alien that seems to look the closest to the Engineer.
The creature also showed timidness and a lack of understanding of the world and its surroundings, unusual considering the cunning and stealth typically displayed by adult Xenomorphs. The creature generally displayed an almost childlike demeanor in a grim way, humming tunelessly as it toyed around with its victims' remains, showing cruel innocence, a trait very similar to many human children who simply don't yet understand the repercussion of their actions. The newborn (when confronting Call at the door) somehow understood the situation the ship was in by not being able to leave with the door being stuck open, in which the newborn grabbed and closed it, either knowing it was in danger or Ripley 8 was due to following her onboard.
Being able to simply kill the alien queen with one swipe is no mean feat but barely after birth makes it clearly by far one of the strongest aliens to have appeared.
Behind the Scenes
Concept and design
The Newborn creature Joss Whedon originally scripted the Newborn Creature in Alien Resurrection as being an eyeless, ivory-white quadruped with red veins running along the sides of its head. It had an inner jaw, with the addition of a pair of pincers on the sides of its head. These pincers would have been used to immobilise its prey as it drained it of blood through the inner jaw. The creature was also meant to rival the Queen in size. Jean-Pierre Jeunet, the film's director, later asked ADI to lean towards making the human-Alien hybrid, known as the Newborn, more human than Alien. The Newborn's eyes and nose were added to improve its expressions to make it a character, rather than just a "killing machine", and give it depth as a character. Jeunet was adamant about the Newborn having genitalia, a mix of both sexes. However, Fox was uncomfortable and even Jeunet felt "even for a Frenchman, it's too much." The genitalia were digitally removed in post-production. The Newborn animatronic required nine puppeteers and was the most complex animatronic in the film.