Nolan Grayson hits first, and he hits like a freight train wrapped in a rocket. Omni-Man's opening assault is precisely what you'd expect from a warrior who spent centuries perfecting the Viltrumite doctrine of overwhelming violence — thunderous haymakers that crack the sky, sonic booms from body blows, grabs designed to shatter bone and spirit simultaneously. Mark takes every single one of them. He bleeds. He reels. He spits crimson into the stratosphere. But he does not stop. Because he is his father's son, and his father made him impossible to finish.
The thing about fighting another Viltrumite is that your greatest weapon — raw, catastrophic physical punishment — is also their greatest gift. Omni-Man's fists are extraordinary. They are not extraordinary enough. Mark matches him punch for punch across the upper atmosphere, absorbing punishment that would reduce continents to rubble while simultaneously pouring everything back into Nolan's jaw, his ribs, his composure. The elder Viltrumite's durability is staggering, his healing relentless. Every window Mark opens to end this closes before he can climb through it.
"You can't beat me, Mark," Nolan growls, blood streaming from a split above his eye that is already closing. It's not arrogance — it's honest arithmetic. But the arithmetic runs both ways. Mark grabs his father's collar, headbutts him hard enough to stun him, and spits back: "I don't have to." He doesn't need a kill. He needs to not lose. And a Viltrumite who will not fall is the one thing in the universe a Viltrumite cannot defeat. Every killing blow Omni-Man throws crashes against Mark's endurance and comes back null. The fight cannot be resolved the way Nolan wants it resolved.
The battle grinds on long past the point where a lesser fighter would be nothing but wreckage. Omni-Man cannot seal it. His attacks land, cause damage, and watch that damage refuse to hold. Mark weathers the storm, presses back, denies his father the decisive finish that the Viltrumite way demands. It is not a spectacular closing moment — it is an absence: the absence of an ending Nolan can manufacture. The fight belongs to Invincible not because he destroys his opponent, but because his opponent cannot destroy him, and in a war of two immortal bodies, the one who refuses to be finished wins by default.
WINNER: Invincible REASON: Two Viltrumites sharing equivalent durability and regeneration means neither can deliver a finishing blow, and Invincible's refusal to fall converts the stalemate into his victory by denial.