Invincible season 4 has thrown Mark into Hell, and the show is not done with that detour yet. In episode 4, "Hurm," Damien Darkblood summoned Mark below ground, putting the series’ newest storyline in the middle of a season that had already been leaning hard into bigger cosmic stakes.
The episode mattered because it was not just a tease. It centered almost entirely on Mark and Darkblood, explained the connection between Earth and Hell, and revealed Hell as a realm whose inhabitants predated humans. The post-credits scene then pushed the thread forward again, with Satan sending Darkblood back to Earth after Volcanikka tried to oust him and claim the realm for herself.
That is why fans were already talking about the episode by the time the credits rolled. The Hell chapter landed with a 6.5 out of 10 on IMDb, and a lot of viewers panned the placement of the storyline in season 4, arguing that it broke the momentum of the Viltrumite plot already driving the year. The episode’s decision to strip away other side stories and keep the focus on Mark and Darkblood made the shift even more abrupt to some fans, especially after the season had spent time building toward the Viltrumite War.
That broader arc was moving in a very different direction. Season 4 also set up the Viltrumite War, which destroyed Viltrum and left survivors led by Thragg to assimilate on Earth, while Allen took over as leader of the Coalition of Planets and carried a deadlier version of the Scourge Virus. Against that backdrop, the Hell storyline felt to many like a hard left turn, even as it quietly planted material the animated series can use later.
That is the point of the detour. The Hell storyline was introduced as an original thread for the animated series, after being set up at the end of season 3, and it appears to be laying groundwork for Volcanikka’s later reemergence, which matters because she becomes an important character later in the comics. The show has already shown it is willing to add side quests and new stories around its main plot, as creator Robert Kirkman has said elsewhere, and this one looks built to pay off beyond a single episode. Fans may have wanted the Viltrumites to keep center stage, but the Hell storyline is now part of the larger map.
Season 5 and the seasons after it are expected to bring that map into focus. The open question is not whether Darkblood returns, because Satan already sent him back to Earth. It is how the show connects that return to Volcanikka, and whether the next stretch of Invincible can keep the Hell thread alive without losing the war story that still defines the series’ biggest stakes.
