The movie begins with Eddie Brock (Tom Hardy) trying to find a semblance of peace, having accepted his role as a lethal protector alongside Venom. Their uneasy alliance continues to grow as Eddie adjusts to Venom’s insatiable hunger and chaotic personality. However, their world is shattered when a cosmic anomaly draws the attention of Earth’s mightiest heroes and villains alike.
The anomaly heralds the arrival of Knull (portrayed by a menacing actor), a dark and ancient deity intent on reclaiming dominion over all symbiotes and plunging the universe into eternal darkness. Knull wields the All-Black Necrosword, a weapon of unimaginable power, and commands a horde of symbiotic dragons that descend upon Earth, spreading fear and destruction.
Eddie is reluctantly thrust into the center of the conflict when Venom reveals the horrifying truth: all symbiotes are connected to Knull, and his influence threatens to consume them both. The bond between Eddie and Venom is tested as Venom struggles to resist Knull’s control, leading to tense and emotional moments where Eddie must fight not just external foes but the possibility of losing Venom entirely.
As chaos erupts worldwide, Eddie teams up with unexpected allies, including Anne Weying (Michelle Williams) as She-Venom, and a mysterious figure tied to the symbiotic lore. The film also brings cameos from other Marvel characters, hinting at a broader connection to the Marvel universe. Together, they uncover the key to defeating Knull—a hidden cosmic artifact that can sever his control over the symbiotes.
The climax is a visually stunning showdown in the heart of New York City, where Eddie and Venom face Knull in an epic battle of wills and power. With Eddie’s humanity and Venom’s ferocity combined, they confront Knull in a desperate, high-stakes battle that pushes their bond to the limit.