- Mark must prove he's become the hero he's always wanted to be by stopping an unstoppable force.
- Omni-Man attempts to convince Invincible to join forces with him against Mark's home world, while Debbie looks on, but Invincible is unwilling to turn against Earth. Afterward, Mark deals with the aftermath of the revelation of his father's true purpose on Earth.—Gislef
- Immortal Man's body, cut in half by Omni-Man, falls into a cornfield. In the sky above, Invincible and Omni-Man hover and face each other. Omni-Man tells his son that they need to talk. Invincible takes in his blood-covered father, punches him, and says that someone must he controlling him. Omni-Man tells his son to stop and breaks his grip, and says that he isn't being controlled.
Omni-Man tells Invincible that it's time for his son to know where he really comes from. He explains that he's from Viltrum, and the natives reached their full potential by removing the weak. When it was over, the Viltrumite population was cut in half and what emerged from the ashes was unstoppable. The Viltrumite survivors decided they would be the only empire, and swept out across the galaxy. Some species resisted, but no one could withstand them for long and the Viltrum Empire encompassed thousands of planets.
With their expansion, the Viltrumites were spread too thin. The most trusted officers were each given a planet to weaken. Omni-Man was chosen for Earth, came there, married Debbie, and they had a son: Mark.
Now, Omni-Man and Invincible need to work together to get Earth ready to join the Viltrum Empire. Omni-Man says that it's good news, and they can finally be who they were meant to be. He says that he couldn't tell the truth until Invincible had his powers and Omni-Man was sure that Invincible was a Viltrumite. Invincible insists that Omni-Man loves him and Debbie, His father tells him that Viltrumites, and Invincible, will live for thousands of years. Everyone Invincible knows and loves will be dead before he looks 30, and they can help humans by stopping wars
Invincible is shocked when Omni-Man says that Debbie is more like a pet to him, and says that he isn't going to enslave his friends for aliens that he's never met .Omni-Man says that he can't let Invincible interfere, and Invincible braces himself to fight.
Omni-Man punches Invincible to the ground below, and easily catches Invincible's next punch. He then throws Invincible away and flies after him, while Cecil's people track them via the drones. Debbie tells Cecil that her husband and son will kill each other, and Cecil has to stop them. Cecil orders his people to scramble jets out of Chicago, to distract Omni-Man so Invincible can think of something.
The Guardians watch from their base, and Rudy says that they follow Cecil's orders and stay there. Samson agrees, and Atom Eve flies in and Rex hugs her in relief. The others tell her what's going on with Invincible and Omni-Man, and Rudy warns that Invincible will have to be invincible to face Omni-Man and survive.
Omni-Man and Invincible continue fighting, and the fighters circle them. When Omni-Man throws Invincible to the ground, the pilots open fire. The missiles have no effect on Omni-Man, and he smashes through one fighter. The pilot plummets toward the ground, and Invincible flies up and catches him.
The ejector seat's chute ejects, knocking Invincible away. He flies back, recatches the pilot, pulls him out of the seat just before it crashes into the ground, and lands nearby. As the pilot thanks Invincible, Omni-Man lands behind the pilot, grabs his skull, and crushes it to demonstrate to Invincible the futility of saving him. Omni-flies up after the other pilot, and Invincible grabs his father before he can bring down the other jet. Omni-Man says that it made no difference that the pilot died when he would have died of old age anyway.
Omni-Man punches Invincible into the city, devastating the streets. Invincible recovers and looks around at the destruction caused by his fall. A building he was smashed through starts to fall, and Invincible flies up to catch it. A mother and daughter fall out the window as the building tilts over, and Ii grabs the mother by the hand as the daughter holds onto the edge. The building collapses despite Invincible's efforts.
Cecil and Debbie watch the carnage from the GDA monitor room.
Invincible climbs out and discovers that he is clutching the mother's severed arm. He drop it and collapses sobbing to his knees, and Omni-Man flies down and says that it was Invincible's fault because of his stubbornness against the inevitable. He asks Invincible how many more need to die, and it's up to Invincible. Omni-Man says that Invincible knows that he's right, and Invincible asks him if Debbie's life is worthless. His father says that in the grand scheme of things it is. Listening, Debbie breaks into tears.
Furious, Invincible attacks Omni-Man, who stops him and tells his son that for the first time in his life, he's telling Invincible the truth. He slams Invincible into the subway below, then holds him up as a subway train approaches. It slams into them, shatters around Ii, and crashes into the station.
When the crash is over, Omni-Man tells Invincible that the people are meaningless. Invincible says that Omni-Man is wrong, and he's seen his father die to protect humanity. He figures that Omni-Man was a Viltrumite when he came to Earth, but he's changed and was happy there. Omni-Man concedes that he was happy for a time, but he's loyal to Viltrumite.
Invincible attacks Omni-Man again, who easily dodges his blows and flies him up into the sky. Invincible breaks free, and Omni-Man grabs him again and says that he'll burn the planet down rather than live among the "animals" for another minute. He punches Invincible repeatedly up into the clouds, then says that he was wrong to raise Invincible as a human and should have prepared him better.
Samson says that they can still save lives and should move out. When Rudy says that Cecil's orders were to stay there, Dupli-Kate tells him that they don't care. Monster Girl tells Rudy that he's not a robot anymore, takes Rudy's hand, and they go with the others.
Omni-Man slams Invincible into the ocean bottom, then takes him up through an ocean liner and throws his son into a mountain. The impact causes an avalanche that buries Invincible and wipes out the town below. Omni-Man asks Invincible if he's had enough yet. When Invincible says he'll stop Omni-Man yet, Omni-punches him into another mountain and insists that Earth joining the Viltrum Empire will make it better than it ever was. He says that they're to show the humans how wrong they are if they resist.
When Invincible doesn't yield, Omni-Man beats him and says that he can start again with another son. As he shatters Invincible's teeth, Omni-Man remembers when he and Debbie watches a tooth-gapped Mark playing baseball as a child. Nolan isn't thrilled with wasting his time watching the game, and it's a waste of everyone's time. Debbie says that they made Mark, and when their son feels joy, his parents feel joy.
Mark hits a home run and runs the bases. Debbie tells Nolan that their children remind them of the joys in life, and that's humanity. Nolan smiles and cheers Mark as his son slides into home base and is safe Debbie and Nolan hug, and Mark runs over and joins them. Nolan picks up his son and says that he saw it.
In the present, Omni-Man looks at the bloody and beaten Invincible. He curses and collapses next to Invincible, then yells at Invincible asking why he made his father beat him. Omni-Man yells that Invincible is fighting so that he can eventually see everyone around him die. He asks what Invincible will have after 500 years, and Invincible says that he'll still have his father. Omni-Man stares at his son's blood on his hands, then flies off the planet, grief-stricken.
Cecil, Debbie, and GDA medics arrive by helicopter and take Invincible to a hospital.
Will and others watch the newscasts about the devastation in Chicago caused by the fight.
The Mauler Twins destroy their base and leave. They find GDA soldiers waiting to arrest them., and surrender.
The Guardians rescue people from the wreckage.
Mark wakes up and finds Debbie at his bedside. She says that he'll be okay and it's all over, and says that she's proud of him. Debbie leaves and out in the hallway, breaks into tears. Cecil approaches her and says that they're preserving Nolan's secret identity as Omni-Man to protect his family, by saying that Nolan died in the house explosion across the street. Nolan's travel books will sell well after his death, and they sent proxies of Debbie and Mark to Nolan's funeral.
Debbie thanks Cecil for his cover-up, and Cecil says that Nolan fooled him and he's trying to make things as right as he can for Debbie and Mark.
The Guardians return to their base, exhausted from their rescue efforts, and Rex cleans the bloodstain "reminder" off the wall. Samson says that they haven't earned it, and when Rcx ignores him, Samson grabs his soldier. The other Guardians prepare to attack Samson, and Samson tells Rex that now they look like a team. The others join Rex in his efforts.
At the high school, Amber and Will are in a daze at what happened.
At the GDA hospital, Debbie remains at Mark's side.
The Guardians continue their training exercise.
Art works and looks at a photo of him and Nolan, together as friends.
Will sits in the cafeteria, alone.
Atom Eve lies on the bed in her treehouse.
Art throws away his photos of himself and Nolan.
The Guardians continue bonding.
Amber continues working at the center.
Debbie sleeps next to the unconscious Mark.
Will goes to the Grayson home and finds the mail piling up. Eve arrives and greets Will, and asks if he's heard from Mark. She realizes that Will knows Mark is Invincible, and Will is relieved that he didn't give away Mark's secret identity. They wonder if Mark is okay.
Mark wakes up, and Cecil tells him that it's a hell of a thing that he did. Cecil explains that Mark has been unconscious for almost two weeks, and tells Mark to rest when he asks where Omni-Man went. Mark goes after Cecil, and admits that he doesn't know if he still wants to be a hero. Cecil tells Mark to come with him, and takes him to a blank white room. He says that Debbie heard everything Omni-Man said, so Mark doesn't have to explain it to her. Cecil explains that Debbie deserved the truth, and she was holding out hope that Omni-Man had a good reason for killing the Guardians.
Mark agrees and wonders where they are, and Cecil turns on the lights the camouflage and reveals a secret weapons workshop. Immortal's body is there, being examines. Cecil turns the lights back off, and explains that people are fed chemicals in their room that prevent them from seeing certain frequencies of lights, and the frequencies are used in the room. He then tells Mark that Omni-Man flew out of the solar system and the galaxy, and they need a replacement.
Mark says that he won't be a hero yet, because it's too much. Cecil takes Mark and Debbie to their home, and says that they fixed it and did everything to cover up Debbie and Mark's absences from work and school. He tells them to call him if they need anything else and leaves.
Inside, Debbie goes to lie down and Mark looks at a photo of his family. He remembers his father telling him that he and Mark have responsibilities as Viltrumites, that normal humans don't. When Mark remembers Omni-Man beating him, he angrily slaps the photo face down.
Discovering that the refrigerator is empty, Mark calls upstairs to Debbie that he's going to order them something for dinner. When Debbie doesn't respond, Mark goes upstairs and sees Debbie on her bed, crying. She doesn't see Mark, and he quietly leaves.
The doorbell rings, and Mark answers it to find Amber there. She hugs him and says that they can together if Mark wants. Amber has figured out that Omni-Man is Mark's father Nolan, and asks if he wants to talk about it. Mark says that he thinks he does.
The doorbell rings again, and Mark finds Will and Eve there. Mark explains that Amber knows Omni-Man is his father, and suggests that they all go out.
In his shop, Art is drinking. Debbie comes in, and she tells Art that she still can't believe that her time with Nolan was a lie. She wishes that Nolan would come back, and Art says that he does as well. Debbie then tells Art to pour her some of his Scotch.
Mark and the others go to BurgerMart, and he says that it's good they're there because he needs to get out of the house. He gets a call from Cecil saying that he needs Mark, and Mark excuses himself to talk to Cecil privately. Cecil tells Mark that some is flying toward Earth from deep space, and they don't know who it is.
Inside, the building shakes briefly. Eve tells Amber and Will that she's Atom Eve, They barely remember her heroic identity.
Mark flies into space, donning his Invincible costume. Allen arrives to warn Invincible that Earth is off-limits, and there is a Viltrumite living there. They sit on the moon and Invincible tells Allen the situation. Allen says that Viltrumites don't just give up, and they blew up Allen's planet rather than lose. The alien says that the Coalition of Planets is trying to unite enough worlds to stop the Viltrumites, and figures Omni-Man abandoning his post could be the advantage they're looking for. Invincible smiles, and says that he's learned Earth is just a small part of a bigger situation makes it all feel more manageable.
Allen warns Invincible that the Viltrumites will come for Earth, because they don't give up without a fight. Invincible assures Allen that he'll be ready, Allen wonders what Invincible will do in the meantime.
The Seequids overrun Mars.
The Maulers are imprisoned.
The Coalition prepares to strike against the Viltrumites.
Doc Seismic commands a race of subterranean buildings.
A crime boss who can turn into a dragon attacks Titan.
Battle Beast attacks two alien pilots on a spaceship.
Cecil checks on Sinclair, who is making an army of Reanimen for the GDA.
Invincible tells Allen that he's going to finish high school.
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