| No.overall | No. inseason | Title | Directed by | Written by | Original release date |
| 18 | 1 | "You're Not Laughing Now" | Jason Zurek | Simon Racioppa | February 6, 2025 (2025-02-06) |
| Three months after his battle with Angstrom, Mark continues training under Cecil's supervision to gain enough strength to compete with Viltrumites while avoiding Eve. Mark and Rex try to stop two thieves, Dropkick and Fightmaster, from stealing the Declaration of Independence, but are attacked by Kate's brother, Multi-Paul, who tries to avenge his sister's death. Kate and the Immortal come out of retirement while Rae returns to the Guardians. William and Rick encourage Mark to confess his feelings and ask Eve out, but warn him against telling her about her future self. However, Mark lets it slip, leading Eve to reject him. Doc Seismic breaks out of confinement and kidnaps Earth's superheroes using giant underground creatures. When Mark and Eve fail to save the heroes, Cecil sends in Darkwing II and Reanimen to help, with Darkwing II recapturing Doc Seismic. Mark confronts Cecil for lying to him and working with Darkwing II and Sinclair, leading Cecil to trap him in the White Room, which was constructed to keep him safe from Mark. Allen and Nolan bond in prison while the Viltrumites begin testing Allen to determine the source of his newfound strength. |
| 19 | 2 | "A Deal with the Devil" | Haylee Herrick | Helen Leigh | February 6, 2025 (2025-02-06) |
| In a flashback, Cecil objects to his predecessor rehabilitating criminals. In the present, Mark destroys Reanimen deployed to stop him. Cecil activates a device installed in Mark's head matching the Atlantean kaiju's roars, causing him intense pain and preventing him from flying. Mark flees to the Guardians for help but Cecil arrives and attacks Mark with more Reanimen, prompting the Guardians to aid him. Rudy jams the signal that is harming Mark while Cecil, realizing his mistake, deactivates the Reanimen. A furious Mark threatens to kill Cecil should he approach him or his family, ending their working relationship. The Guardians break up, with Monster Girl, Rex, Rae, Bulletproof, and Rudy losing trust in Cecil, while the Immortal, Kate, Samson, and Shapesmith remain and are joined by Darkwing II. Cecil later reflects on his first meeting with Nolan and developing his personal code of doing anything to protect Earth while Mark and Eve reconcile and start a relationship. |
| 20 | 3 | "You Want a Real Costume, Right?" | Sol Choi | Jay Faerber | February 6, 2025 (2025-02-06) |
| Mark receives a new suit from Rosenbaum. After getting his own suit, Oliver names himself "Kid Omni-Man", but Mark advises against it, explaining the destruction Nolan caused, before they join forces to stop Titan from breaking out Multi-Paul. Eve moves back in with her parents, promising not to use her powers at home if they become more accepting of her duties as a hero. Debbie forms a relationship with her colleague Paul and reveals to him Nolan, Mark, and Oliver's secret identities, angering Mark. The Maulers break into a missile silo, planning to launch an EMP device to destroy the world's communication systems, and incapacitate the attacking Guardians. Mark destroys the missile while Oliver, against Mark and Debbie's wishes, kills the Maulers. He reveals to Mark his indifference to killing, believing Nolan may be right, worrying Mark. While talking with Oliver, Mark notices a floating orb-like drone spying on the Grayson household, which detonates in his hand as he catches it. Unbeknownst to him, the drone belongs to Angstrom, who survived his previous encounter with Mark. |
| 21 | 4 | "You Were My Hero" | Ian Abando | Tania Lotia | February 13, 2025 (2025-02-13) |
| Mark asks Rudy to analyze the drone, which he determines originated from Earth and was created by someone with vast resources. Mark confronts Cecil, believing he built it, but Cecil denies it. Later, while on a date with Eve, Fightmaster and Dropkick forcibly recruit Mark and bring him to their future, believing he can save their Earth from its tyrannical king, the Immortal. Driven mad by his immense power and immortality, he blames Mark for his eventual abandonment of Earth and demands he fight him to the death to bring him peace. Reluctantly, Mark fights and is eventually forced to kill the Immortal. Returning to the present, a shaken Mark finds solace with Eve. Meanwhile, Nolan faces execution until Allen breaks free, liberates their fellow inmates, gains Battle Beast's help in fending off the Viltrumites, and feigns defeat to spur Nolan into action. After breaking out, Allen suggests they flee before reinforcements arrive, but Nolan reveals the Viltrum Empire now consists of fewer than fifty pure-blooded members. |
| 22 | 5 | "This Was Supposed to Be Easy" | Tanner Johnson | Helen Shang | February 20, 2025 (2025-02-20) |
| After Mark suggests that he and Eve get their own apartment, she offers Invincible's services to a supervillain prison. Debbie later sends the couple out in search of Oliver, whom they discover has befriended two children while defending them from bullies. Meanwhile, Titan is pressured by Mr. Liu, a fellow crime boss and the leader of a criminal organization called the Order, into breaking out Multi-Paul or Liu will kill his family. Titan attempts to manipulate Mark into helping him before Liu attacks the prison holding Multi-Paul. While fighting Mark and Eve, Multi-Paul escapes while Titan's henchman, Isotope, frees Machine Head, who shoots Liu. Afterwards, Mark and Eve decide to take their relationship at a slow pace. Machine Head assumes control of the Order and grants Titan his autonomy, unaware that Liu survived. |
| 23 | 6 | "All I Can Say Is I'm Sorry" | Jason Zurek | Ross Stracke and Simon Racioppa | February 27, 2025 (2025-02-27) |
| Having witnessed his sister and niece's deaths during Mark and Nolan's fight in Chicago, GDA scientist Scott Duvall steals advanced bio-capacitors to augment his ability to convert kinetic energy into electrical power and publicly challenges Mark. Wishing to take the night off to celebrate William's birthday, Mark ignores Scott while Shapesmith answers his challenge. Scott defeats Shapesmith and flees to his wife Becky and son Jack, fearing GDA retaliation. As Rudy works with Monster Girl to stop her powers from de-aging her body when she uses them, Rae confesses to Rex that she plans to retire from superhero work, which he accepts before they kiss. Amidst a memorial for the Chicago massacre, Scott takes the name "Powerplex" and tries to lure out Mark again, but is defeated and captured by Eve. Nonetheless, Scott escapes and returns to Becky, who suggests he stages her and Jack's kidnapping and use them as bait. Mark attempts to talk Scott down, but Scott accidentally kills his family while fighting Mark. After being taken into GDA custody, Scott vows revenge on Mark. Elsewhere, Angstrom gathers several of Mark's multiversal variants. |
| 24 | 7 | "What Have I Done?" | Haylee Herrick | Robert Kirkman | March 6, 2025 (2025-03-06) |
| Angstrom sends his Invincible variants to destroy Earth and tarnish Mark's image. The GDA, the Guardians, and Earth's heroes are overwhelmed and suffer heavy losses. Scott briefly escapes; Eve is incapacitated; Rex sacrifices himself to save Rudy, Monster Girl, and Bulletproof; Darkwing II is presumed dead; and the Immortal, Kate, Samson, and Shapesmith are wounded. When the surviving Invincibles turn on Angstrom, he traps them on a desolate Earth before battling Mark. Mark overpowers and nearly kills Angstrom, but he escapes to the Technicians, advanced cybernetic surgeons who previously healed him. Angstrom orders them to fix his wounds, but they refuse, demanding he repay them for all they have done for him. In the aftermath of Angstrom's attack, an aged Viltrumite envoy named Conquest arrives to survey Mark's subjugation of Earth for the Viltrum Empire and is disappointed by his lack of progress. Devastated by the destruction and deaths directed at him, Mark charges at Conquest to vent his rage. |
| 25 | 8 | "I Thought You'd Never Shut Up" | Sol Choi | Robert Kirkman | March 13, 2025 (2025-03-13) |
| Conquest and Mark fight, destroying cities and maiming each other in the process. Oliver and Eve attempt to intervene, but are injured. Nonetheless, Eve temporarily overcomes her mental blocks, allowing her to reconstruct her body and burn Conquest's skin off before Mark seemingly kills him. Mark awakens in the hospital, where Debbie apologizes for bringing him into this world, though Mark says he does not blame her. At Rex's funeral, Rudy changes his name to Rex to honor him. As the world rebuilds, Rus builds up an army of Sequid-possessed humans, a group of aliens find Battle Beast, and the Technicians fully heal Angstrom before working out a partnership to claim a new world. Cecil reveals to Donald he has captured a comatose Conquest and placed him in an underground prison, intending to interrogate him about the Viltrum Empire. Mark tells Oliver he was right to kill people, promising to do so to anyone who threatens their family. Meanwhile, Darkblood meets with a demon overlord to help reinstate him as Hell's ruler by exploiting a powerful being on Earth. |