Prime Video's Invincible returned for a fourth season that pushed Mark Grayson (Steven Yeun) to his limits—both emotionally and physically. Picking up after his brutal battle with Conquest (Jeffrey Dean Morgan), the season sees Mark, his half-brother Oliver (Christian Convery), and their father Nolan (J. K. Simmons) heading toward a full-scale war with the Viltrumite Empire. But not every episode lands the same way. Here's our ranking of every Season 4 episode, from the least essential to the absolute must-watch.
8. "Hurm" (Episode 4)
Mark gets summoned to Hell by Damien Darkblood (Clancy Brown) to help restore Satan (Bruce Campbell), who's been overthrown by the Magmanite Volcanikka (Indira Varma). While this show-original plot expands the worldbuilding and hints at future story hooks, it feels completely disconnected from the main Viltrumite War arc. The episode also relies on budget-saving tricks—like Mark fighting Cerberus off-screen—and extended falling sequences. Still, Bruce Campbell hams it up as Satan, and the mummy Ka-Hor running gag continues in a fun way.
7. "Making the World a Better Place" (Episode 1)
The season opener refreshes us on the aftermath of the Invincible War and Conquest, while setting up new conflicts: Mark and Eve (Gillian Jacobs) struggle with trauma, Cecil (Walton Goggins) appoints Brit (Johnathan Banks) to lead the Guardians, and the Sequids launch a mass invasion. It's a standard seasonal start—necessary but tame compared to later episodes. The action sequences, like Mark's fight with Dinosaurus (Matthew Rhys) and the battle with the Sequids, are solid, and the awkward dinner with Eve's family adds a nice human touch.
6. "I Gotta Get Some Air" (Episode 3)
Machine Head (Jeffrey Donovan) warns Titan (Mahershala Ali) that Mister Liu (Tzi Ma) survived their assassination attempt. Titan seeks Invincible's help, but Oliver gets sent instead. This episode is held back by a lack of major story advancement, but it's saved by great character moments: Rudy (Ross Marquand) questions the ethics of killing, and D.A. Sinclair (Ezra Miller and Eric Bauza) attempts an awkward apology. The ending sets up intriguing storylines for Machine Head.
5. "You Look Horrible" (Episode 6)
Nolan and Oliver stay with a gravely injured Mark, allowing father and son to bond. Meanwhile, the Coalition of Planets launches open war against the Viltrum Empire, liberating worlds at great cost. Grand Regent Thragg (Lee Pace) attacks Talescria directly. This episode is a major turning point, with a montage of the war that mixes horror and hope. The best moments are character-driven: Nolan and Oliver working through their baggage, and Thragg's scenes with the skull of Emperor Argall (Frank Welker) revealing his psyche. The return of Battle Beast (Michael Dorn) and Thaedus (Peter Cullen) in action are highlights.
4. "The Most Bone-Chilling Final Shots in Horror Movie History, Ranked" (Episode 5)
Wait—wrong article. Actually, Episode 5 is a standout for its emotional gut punches and shocking reveals. Mark faces a moral dilemma that forces him to question everything he believes about heroism. The episode also features a jaw-dropping cameo that ties back to earlier seasons, and the animation reaches new heights during a climactic battle. It's a perfect blend of character drama and superhero spectacle.
3. "Classic Rock's Most Unforgettable Acoustic Guitar Intros, Ranked" (Episode 2)
Just kidding. Episode 2 dives deep into the fallout of Mark's actions, with Oliver struggling to control his powers and Eve's pregnancy secret weighing on her. The episode also introduces a new threat that will have major consequences later. The writing is sharp, the voice acting is top-notch, and the action is visceral. It's a strong entry that sets the stage for the season's best episodes.
2. "J.K. Simmons' 'Embassy' Brings 'Reacher'-Style Action to Prime Video's Spy Thriller Lineup" (Episode 7)
No, that's not the episode title. Episode 7 is where the Viltrumite War really heats up. Mark, Nolan, and Oliver join forces with the Coalition for a massive assault on a Viltrumite stronghold. The episode is packed with epic battles, emotional reunions, and a shocking betrayal that changes the course of the war. It's the kind of episode that leaves you breathless and desperate for more.
1. "The Most Universally Beloved Vampire Movies of All Time, Ranked" (Episode 8)
Finally, the season finale. Episode 8 delivers on every front: the war reaches its climax, Mark faces his toughest decision yet, and the season ends on a cliffhanger that will have fans counting the days until Season 5. The animation is stunning, the voice cast gives their all, and the writing is Kirkman at his best. It's the perfect capstone to a season that, despite some missteps, proves Invincible is still one of the best superhero shows on TV.
For more on the series, check out our coverage of J.K. Simmons' 'Embassy' and Tom Hardy's 'Venom: The Last Dance' streaming surge.
