In this animated sequel, Miles Morales journeys across the multiverse, encountering a vast society of Spider-People led by Miguel O'Hara, and learns about "canon events" that dictate the fate of every Spider-Person.

The animated film described is "Spider-Man: Across the Spider-Verse (Review)," the highly anticipated sequel to 2018's "Spider-Man: Into the Spider-Verse." This movie continues the adventures of Miles Morales, a Spider-Man from Earth-1610, as he navigates the complexities of the multiverse. The film's central plot revolves around Miles journeying across different dimensions, encountering a vast and diverse collective of Spider-People known as the Spider-Society. This society is led by the enigmatic Miguel O'Hara, also known as Spider-Man 2099.

A core concept introduced in this sequel is "canon events," which are crucial moments that are believed to dictate the fate and development of every Spider-Person across the multiverse. These events, such as the death of a police captain close to Spider-Man (Review), are presented as essential to maintaining the stability of their respective universes. Miles finds himself at odds with Miguel and the Spider-Society when he challenges the idea of these predetermined events, particularly when a canon event threatens someone he cares about.

The movie is celebrated not only for its compelling story but also for its groundbreaking animation, which features distinct visual styles for each of the six universes Miles visits. It involved a massive production, reportedly employing around 1,000 animators and featuring designs for approximately 240 characters, making it one of the largest animated film crews ever. The film delves deeper into the emotional struggles of its characters, exploring themes of destiny, choice, and what it truly means to be Spider-Man.