Thragg made good on his reputation in Invincible Season 4, Episode 7, "Don't Do Anything Rash," tearing through Nolan, Mark and their allies during the battle over Viltrum and leaving no doubt why the Grand Regent sits at the top of Viltrumite power. He sent Nolan crashing through Viltrum's atmosphere with one punch, hammered him again on the planet's surface, then punched through his torso and left him disemboweled but still barely alive.
The fight did not end there. Thragg emerged from the rubble of Viltrum, decapitated Thaedus and then easily bested Mark, getting close enough to crush the young hero's head before stopping himself. The reason was as cold as it was practical: there are already too few Viltrumites left. Thragg's restraint was not mercy. It was arithmetic.
That is what makes him different from every other fighter in the series, including Conquest, who knelt in fear before Thragg in Season 4 Episode 2. Viltrumite culture reveres strength above all else, and Thragg was raised inside that creed from birth. He is the heir to the late Emperor Argall, trained from the start to inherit leadership and, by the show's own logic, to embody the empire's idea of strength. A plague has left fewer than 50 pureblood Viltrumites alive, which makes every death matter more to the Grand Regent than any victory speech ever could.
The episode also shows why this conflict matters now. In "Don't Do Anything Rash," Nolan decides to destroy Viltrum, Space Racer blasts a hole through the planet so Nolan, Mark and Thaedus can reach the core, and the fact that Viltrumites can survive the heat of a molten core without burns turns the assault into a test of who can endure longer, not just who can strike harder. Thragg calls Thaedus "The Great Betrayer" and says Argall has finally been avenged, turning the fight into punishment as much as conquest. The show has already spent time adding layers to Conquest in the Season 3 finale, including a monologue about being lonely because his ferocity terrifies other Viltrumites, but Thragg's introduction is different: he is not isolated by fear, he is defined by control. Like Nolan's destruction of the Flaxan civilization in Season 1, his violence is not random. It is decisive, total and, for now, unmatched.
That is the answer to the question Thragg's arrival raises: yes, he is the strongest Viltrumite in Invincible, and Season 4, Episode 7 proves it by letting him dominate the only fighters who had any real chance of challenging him.