"Alien 3" flopped for several reasons. Firstly, it faced significant production challenges, including a troubled development process and changes in directors, which led to a disjointed vision. The film's dark tone and the decision to kill off beloved characters from "Aliens" alienated fans. Additionally, the marketing was misleading, emphasizing action over the horror elements that defined the franchise. Mixed critical reception and a lack of coherence in storytelling contributed to its poor box office performance, ultimately making it a disappointment compared to its predecessors.

In "Alien 3," Ripley becomes pregnant with an Alien embryo after a facehugger attaches to her while she is in stasis. This occurs after the events of "Aliens," when the escape pod carrying Ripley and the surviving characters crashes on the prison planet Fiorina 161. The facehugger was presumably on board the pod or attached to her during the crash, leading to the implantation of the embryo. This plot point adds a significant emotional and horror element to the film, as Ripley grapples with the implications of carrying the Alien within her.

Newt, along with Bishop, was killed off in the opening of "Alien 3" to establish a darker tone for the film. The decision was made by director David Fincher and the screenwriters to emphasize the themes of isolation and loss, as well as to create a sense of futility in the fight against the alien threat. The deaths were controversial among fans, as Newt was a beloved character from "Aliens," but they served to propel the story into a more somber direction, focusing on Ripley's struggle in a prison setting.

In "Alien 3," the alien is different because it is born from a dog (or ox, depending on the version) rather than a human host. This results in a creature that is smaller and more agile than its predecessors, with a unique design that reflects the animal's biology. The film explores the implications of this alien's rapid development and its distinct behavior, emphasizing the horror of its unpredictability. Additionally, the setting in a prison adds to the film's bleak tone and themes of isolation and survival.