Invincible (2021 Cartoon Series) - Season 3 - Episode 7: "What Have I Done?"

Antagonist Angstrom Levy orchestrates a multiversal assault by unleashing 18 malevolent versions of Mark Grayson upon Earth. This catastrophic event, known as the Invincible War, leads to widespread devastation and significant casualties, including the heroic sacrifices of Rex Splode and Darkwing. As the Guardians of the Globe struggle to defend the planet, Mark confronts the harrowing consequences of his counterparts' actions, setting the stage for an epic showdown.