On Earth-65, police captain George Stacy remains blissfully unaware that his very own daughter, Gwen Stacy, is indeed Spider-Woman. This misconception deepens when the authorities falsely accuse her of murder following an incident involving her boyfriend, who sadly succumbed to an alien attack while Gwen was mistakenly seen leaving the scene.
One fateful night, Gwen encounters an unexpected version of the Vulture, portrayed by [Jorma Taccone], who hails from a peculiar, Italian Renaissance-themed universe. Completely bewildered by his arrival in Gwen's world, he remains oblivious to the concept of the multiverse itself. Fortunately, Miguel O'Hara, aka Spider-Man 2099, alongside Jess Drew from Earth-332, arrives using advanced portal-generating technology, assisting Gwen in subduing the menacing Vulture.
The situation escalates when Gwen’s father corners her, leading to a tense moment where she discloses her superhero identity. Overwhelmed, he attempts to place her under arrest. However, Miguel reluctantly admits Gwen into the Spider-Society, a prestigious alliance committed to safeguarding the multiverse, allowing her a brief escape with him and Jess.
Fast forward to Earth-1610, where sixteen months post the catastrophic explosion of the Alchemax Collider, Miles Morales](/actor/shameik-moore) has an unsettling encounter with the Spot, an Alchemax scientist portrayed by [Jason Schwartzman]. Thanks to the mishap during the explosion, the Spot now possesses the ability to open portals at will. As he confronts Miles, he asserts that it was the young Spider-Man who caused his transformation and shares how an errant spider from Earth-42 was responsible for Miles gaining his powers. The weight of this revelation is compounded by the tragic memory of Miles losing his criminal uncle, Aaron Davis, in a fateful duel.
Yet, Miles remains silent about his double life to his parents, Jeff Morales and Rio, and aspires to delve into Quantum physics at Princeton University, hoping to learn how to traverse across dimensions. The Spot, seething with resentment, claims that his transformation into a villain is solely due to Miles’ actions, further blaming Spider-Man for the chaos that ensued after the Collider’s explosion.
When Gwen travels to Earth-1610 to rekindle her friendship with Miles while tracking the Spot, she discusses the Spider-Society with him, emphasizing its crucial role in maintaining the stability of the multiverse. Gwen reveals the depth of her feelings towards Miles, stating, “You’re my only real friend since Peter died,” and lays bare her struggles with the society’s rigid regulations. Despite being eager to join the elite group, Miles finds himself stifled by their stringent membership rules.
Gwen investigates the Spot’s lair and uncovers that he has stolen the Collider from her dimension, thus amplifying his powers and enabling him to forge inter-dimensional portals independently. As tensions rise, they pursue the Spot to Earth-50101 alongside a local Spider-man known as Pavitr Prabhakar and Hobie Brown, who aids them against the increasingly formidable foe.
In a stunning twist of fate, both Miles and the Spot share a chilling vision involving impending tragedies: the deaths of Police Inspector Singh, pivotal to Pavitr’s girlfriend Gayatri, and Miles' own father Jeff. After a narrow escape from devastation, the dimensions start to unravel, prompting the timely arrival of Society members to contain the fallout.
Following their harrowing adventure, Miles, Gwen, and Hobie are transported to the Society's headquarters situated on Earth-928, a sprawling enclave housing myriad Spider-People, where they meet Miguel and Peter B. Parker. Miguel expounds on the concept of "canon events," pivotal moments in each Spider's journey, asserting that any deviations could spell disaster for not just individual realities but also for the overall multiverse itself.
Realizing that Jeff's imminent promotion to captain makes him a target for the Spot, Miles becomes desperate to intervene. Yet, when Miguel imprisons him to prevent interference with the timeline, Hobie, disillusioned by the Society's tactics, aids Miles in escaping and resigns from the group.
As chaos ensues, Miguel confronts Miles, revealing the harsh truth: the spider that bestowed Miles with his abilities originated from Earth-42, which caused a ripple effect that led to Peter Parker's downfall and the emergence of the Spot. Fueled by determination, Miles breaks away from Miguel's grasp in search of what he believes to be home.
However, upon using the Society's "Go-Home" machine, Miles unwittingly finds himself in Earth-42, the birthplace of his fateful spider. Here, he discovers an alternate reality where his Uncle Aaron is alive while his father has perished. In this crime-ridden New York City, he faces an unexpected confrontation with an alternate version of himself, who has become the Prowler.
As the Society continues the search for Miles across Earth-1610, Gwen ascends to the same dimension, promising to return him home while the Spot prepares for a multiverse-wide assault. With urgency building, Gwen assembles a team to rescue Miles, uniting forces with Peter B., Mayday, Pavitr, Hobie, and an array of other Spider-beings to combat the encroaching threat.
