America Under Siege ranks among the largest assaults ever staged on American soil in Invincible. Doc Seismic, after months studying the heroes' every vibration, springs a coordinated trap, and the day turns on ReAnimen intervening to save the captured defenders.
America Under Siege counts among the heaviest attacks the country endures across the series. Doc Seismic mounts the offensive after spending his imprisonment learning the precise vibrations of Earth's heroes, from how they move to how they breathe. The battle spans the Pentagon and the Guardians Headquarters, pitting Invincible, Atom Eve, and the wider hero roster against Seismic and his minions.
Doc Seismic launches the siege boasting that months of study made his time behind bars worthwhile, and he captures much of the hero lineup. The tide turns through the ReAnimen deployed with Darkwing II. One construct rescues the Immortal, Dupli-Kate, and Rex Splode, while another pulls Invincible and Atom Eve to safety, only for Mark to destroy that one moments later.
The clash unfolds during the Thragg Era in early 2024, following the Assault on the Graysons and leading into the events labeled Turning Point. It stands as a marquee confrontation of the season, staged across the Pentagon and the Guardians Headquarters as Doc Seismic tests the full strength of America's protectors.

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Doc Seismic leads the assault after spending his prison sentence studying the precise vibrations of Earth's heroes, from how they move to how they breathe, in order to plan his revenge.
The fighting spans the Pentagon and the Guardians Headquarters as Doc Seismic and his minions face off against Invincible, Atom Eve, and the wider hero roster.
ReAnimen deployed alongside Darkwing II turn the tide of the battle, with one construct freeing the Immortal, Dupli-Kate, and Rex Splode, and another pulling Invincible and Atom Eve to safety.
Moments after being rescued, Invincible destroys the ReAnimen construct that pulled him and Atom Eve out of danger.
America Under Siege takes place in the Thragg Era during early 2024, following the Assault on the Graysons and leading into the event known as Turning Point.
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