With Earth’s primary protector down, a new interdimensional threat—the Flaxans—invades through a portal. Their technology causes them to age rapidly on Earth, but they adapt with protective armor.
Here is a detailed breakdown of the episode based on its 2021 release:
A recovered Omni-Man returns and ruthlessly destroys the Flaxan invaders, taking the fight to their home dimension. He obliterates their civilization, proving his power level is massively superior to any threat.