Bella Swan, portrayed by Kristen Stewart, is on the brink of a momentous occasion as she prepares for her wedding. The air is charged with tension as Jacob (played by Taylor Lautner) reacts with fury upon hearing about Bella's impending marriage to Edward (Robert Pattinson), leading him to storm out despite his father Billy's attempts to reason with him. Meanwhile, Bella's dear friend Alice steps into the spotlight to orchestrate the wedding, treating Bella like a sister throughout the process.
As Bella navigates her emotions, Edward reveals haunting secrets from his past, mentioning a time when he hunted human blood, admitting that he took lives of those who were criminals and deserving of their fate. That evening, a nightmare befalls Bella—a chilling vision of the Volturi invading her wedding, blood-soaked and surrounded by the lifeless bodies of their guests.
Bella’s circle of friends is filled with familiar faces like Jessica (played by Anna Kendrick), Mike Newton (Michael Welch), Angela Weber (Christian Serratos), and Eric Yorkie (Justin Chon). Meanwhile, Bella's family, the Cullens, includes Edward, Alice (Ashley Greene), Rosalie (Nikki Reed), Jasper (Jackson Rathbone), Carlisle (Peter Facinelli), Emmett (Kellan Lutz), and Esme (Elizabeth Reaser). The werewolves are prominent figures as well, with Jacob, Sam Uley (Chaske Spencer), Quil (Tyson Houseman), and others in the mix, including the only female werewolf, Leah (Julia Jones).
The wedding day arrives, and with Charlie (Billy Burke) giving Bella away, the ceremony unfolds in front of an array of guests, including Bella’s mother, Renee (Sarah Clarke). The Denali Coven, distant relatives of the Cullens, also make an appearance, featuring Eleazar (Christian Camargo), Carmen (Mía Maestro), and others, who add to the celebration. However, the air grows tense when Irina (played by Dakota Fanning), a member of the Denali, is shocked to see werewolves at the event and chooses to leave, dismissing the dangers presented by Laurent's past actions.
During the reception, Jacob confronts Bella, leading to a revealing conversation in the woods where she admits her and Edward's plans for their honeymoon, which ignites Jacob's protective fury. As the couple embarks on their honeymoon to the scenic Isle Esme, Bella nervously prepares for intimacy, but Edward unintentionally causes her pain during their passionate encounter, leading to a change in his demeanor where he treats her with an almost fragile caution.
As their paradise turns complicated, Bella discovers she is pregnant with a child that is part immortal. The rapid progression of her pregnancy also brings about intense visions that only vampires typically experience. Meanwhile, Jacob struggles with the implications of Edward converting Bella. He persuades his tribe, claiming that this transformation breaches their treaty, but much to his frustration, Sam decrees otherwise.
Amidst rising tensions, Bella's health dramatically declines as the fetus grows at an alarming rate, causing her body to suffer. Despite Carlisle's warnings about the perilous nature of the pregnancy, Bella remains determined to keep the child, feeling a bond that even Edward grows to respect as he discovers the baby’s spirit through its thoughts.
However, the looming conflict erupts when Jacob gathers support from his fellow werewolves, leading to a confrontation with the Cullens, which Jacob feels obliged to protect. Bella’s health deteriorates further, leading to a near-fatal labor experience that culminates in a dramatic delivery orchestrated between Edward, Jacob, and a strained Carlisle.
The newborn baby, a girl named Renesmee (Mackenzie Foy), becomes the center of contention as Jacob forms an unexpected bond with her, triggering the Pack’s protective instincts and easing tensions between the werewolves and the Cullens. As additional threats arise with the Volturi, led by Aro (Michael Sheen) and his enforcers, Bella’s transformation into a vampire ignites a fierce struggle for survival, leaving her newfound family to defend their legacy against impending danger, setting the stage for a future fraught with challenges yet to come.
