Most of Thanos' entire army is summons to the ground which include the Black Order, Sakaarans, Chitauri, Outriders, Chitauri Gorillas, and Leviathans. Outnumbered, bloody and battered, Captain America, Sonic, Lincoln, Kirby, Leonardo, and SpongeBob, who are overpowered by Thanos, stand up to the ground. Cap re-tightens the strap on his broken shield to his forearm while Lincoln picks up Caliburn. Sonic looks at his long time idol, counterpart, and friend.
Sonic: Cap, I'm with you until the end!
SpongeBob: Me too!
Lincoln: (holding Caliburn in hand) Me three!
Leo: (picks up his swords) Me four!
Kirby: Me five!
Sonic: Is that the best you can do, Thanos? We're just getting warmed up.
Before they can do anything, a familiar voice is heard from their communicators.
?: Hey, Cap, you read me?
They stop and look around. The voice which turns out to be Sam Wilson, who is known as The Falcon.
Sonic: Who's that?
SpongeBob: It must be the Falcon!
Lincoln: He's alive!
Sonic: And that means?
Falcon: Cap, it's Sam. Can you hear me?
Kirby points at something.
Kirby: Look!
A yellowish orange portal begins to form behind them.
Falcon: On your left.
They look behind to see the portal behind them. Three familiar figures step through; Okoye, along with the Black Panther and Shuri, who are fully restored and ready to fight.
Sonic: Hey, T'Challa! Welcome back!
Black Panther: Hello, Sonic, SpongeBob, Lincoln, Kirby, and Leonardo! (turns to Sonic) And, Sonic, can you give Cream my greetings for me?
Sonic: No problem, T'Challa!
SpongeBob: Well it looks like the Blip actually worked.
Cap, Sonic, SpongeBob, Lincoln, Kirby, and Leonardo and the revived Wakandans share a look when Sam zooms in from above in his Falcon armor. As he does, more portals opening up all around the battlefield. Through one of these, Doctor Strange, who was responsible for the portals. However, he is joined by Drax, Mantis, Star Lord, and Spider-Man. Half the resurrected Wakandan Army were behind T'Challa, Shuri, and Okoye as they chant in Xhosa.
Black Panther: Yibambe!
Wakandans: Yibambe!
Black Panther: Yibambe!
Wakandans: Yibambe!
Black Panther: Yibambe!
Wakandans: Yibambe!
Black Panther: Yibambe!
Wakandans: Yibambe!
The Avengers' allies began to appear through the portals. More heroes who were decimated by Thanos began to appear through the portals, including White Wolf, Groot, Scarlet Witch and Wasp. Sonic saw one portal coming in from Green Hill, Tails, who is piloting the Tornado, with Amy on board, along with Blaze, Cheese, and Cream, who is armed with a Wispon all land on the ground. From Babylon Garden, Wave and Storm, who are riding their Extreme Gear. One from Planet Wisp is Ray, Omega, and Charmy, who is also armed with a Wispon, and the Wisps, including Yacker emerge. More portals from Classic Sonic's World, Mystic Ruins, the Death Egg, Bikini Bottom, Jellyfish Fields, Southern Island, Dream Land, Patch Land, Jambastion, Flying Dutchman's Graveyard, New York, Haltmann Works Company, and Angel Island, which Patrick as Mr. SuperAwesomeness, Sandy as The Rodent, Squidward as Sour Note, Mr. Krabs as Sir Pinch-a-Lot, the Jellyfish, the Flying Dutchman and his pirate crew, the Mage Sisters, Susie Haltmann, Old Man Jenkins with his farm animals, the classic versions of Sonic, Tails, Knuckles, Amy, Metal Sonic and Dr. Eggman, Big with Froggy, Chaos 0, Vector, Espio, Mighty, King Dedede, Bandana Dee, Waddle Dee Army, Meta Knight, Galacta Knight, Dark Meta Knight, Dr. Eggman, Metal Sonic, Orbot, Cubot, the Egg Fleet, the Halberd, Eggman Robots, Meta Knight's Army, Prince Fluff, Master Splinter, Casey Jones, Bebop, and Rocksteady all came out. The other heroes who were not decimated by Thanos also appeared to aid the Avengers in battle: Pepper Potts, donning a blue-and-silver armor, M'Baku, Wong, Valkyrie, Korg, Miek, Howard the Duck, Kraglin, and 2014 Gamora.
Doctor Strange: Is that everyone?
Wong: What you wanted more?
Wong looks to his left and sees Scott emerging from the ruins as Giant-Man, along with Hulk, War Machine, Rocket, Plankton as Plank-Ton, Mikey, Donnie, and Rouge all came out and preparing for battle as they join up with their teammates. Now reunited with their formerly deceased allies and temporarily allies, the leaders look at Thanos with determined looks on their face before everyone gets into a battle stance.
Sonic: Let's do this!
Captain America: Avengers...
As Cap summons Mjolnir, Sonic activates his Spike Shields, and Leo readies his swords.
Sonic & Captain America: ...assemble.
Dr. Eggman: CHARGE!
A loud battle cry from the armies of Light and Darkness charge toward each other for the battle of the planet Earth. With some of the heroes on the ground or in the air, including the Fly Type characters, Dr. Eggman in his Egg Dragoon, Kirby on his Warp Star with the Ultra Sword Copy Ability, SpongeBob flies with bubbles, the Flying Dutchman, Meta Knight, Classic Eggman in his flying drill machine, Egg Flappers, Jellyfish, Wisps, more flying Badniks, NESPs, and every flying hero. Thanos sends the Black Order, Chitauri, Chitauri Gorillas, Sakaarans, and the Outriders to charge the Avengers and their allies to kill them all. With both sides charging, Sonic, Blaze, Classic Sonic, and Shadow outrun the group with their Speed Boost and Flame Burst. Kirby outflies along with those on the ground with his Warp Star. Sonic and Kirby were the first to attack on the ground and the air, then Shadow fires his Chaos Spear to take down the Outriders, Classic Sonic Spin Jumps on them, Captain America uses Mjolnir to shoot lightning, Thor uses Stormbreaker to also fire lightning, Spider-Man, Wasp, and Valkerie attack some soldiers, Hulk throws a Chitauri soldier.
M'Baku: (after attacking a soldier) DIE!
Giant-Man punches a Leviathan to the ground. Black Panther and Sandy use their martial arts and karate skills to combat the Outriders as Shuri fires blasts of sonic energy. Squidward blows his clarinet to ward off the Sakaarans, Jet uses his Bashosens to blow away a few soldiers, Mikey takes down the Chitauri with his nunchucks, Knuckles punching several Outriders and Chitauri, Amy using her Piko Piko Hammer to slam the soldiers away, as Drax climbs behind Cull Obsidian and stabs him a few times with his knives before Korg attacks Cull Obsidian. Rescue fires her repulsors to fire a Necrocraft until Iron-Man flew by her side and fire their repulsors to take down airborne objects. Thor and Cap fight the Chitauri before switching weapons.
Thor: No, no, give me that. You have the little one. (He and Cap swap weapons before fighting the aliens once more)
Meanwhile Rocket, Winter Soldier, and Omega fire their guns at several Chitauri. Espio chops several Chitauri and Outriders. Casey attacking the soldiers by using a hockey stick.
Omega: Must eradicate all Thanos' aliens.
Elsewhere on the battlefield, Cull Obsidian attacking numerous Badniks including the Egg Pawns, Egg Hammers, Flappers, and Egg Fighters until Dr. Eggman whacks him away. Another part of the battle Corvus Glaive killing numerous Waddle Dee, including Waddle Doo, Armored, Parasol, and Big before King Dedede hits him with his hammer. Proxima Midnight started decimating numerous Jellyfish until Rouge used her Bat Bombs and kicked her away. Ebony Maw began attacking the Wisps before being taken down by Bebop and Rocksteady.
Later, Iron-Man is seen fighting some of Thanos' army. But Cull Obsidian punches him to the ground, Iron-Man using his repulsors to kill Cull Obsidian before being saved by his resurrected protege, who uses his Web Shooters to pull him away from his mentor, and then Giant-Man stomps him flat to death and Spider-Man runs to Iron-Man.
Spider-Man: Hey! Holy cow! You will not believe what's been going on. Do you remember when we were in space? And I got all dusty? I must've passed out, 'cause I woke up, and you were gone. But Doctor Strange was there, right? He was like, "It's been five years. Come on, they need us!" And then he started doing the yellow sparkly thing that he does all the time...What are you doing?
Iron-Man: He did? Oh, no.
Tony hugs Peter, making him shocked, but he hugs Tony back.
Spider-Man: Huh...This is nice.
Sonic taking down three Outriders with his Spin Attack and uses his vibranium shields to release a kinetic energy pulse by slamming them. However, Corvus Glaive kicks Sonic from behind. He uses his shields fight him off before dodging the blade until Tails, who threw Dummy Ring Bombs and used his Tail Attack to knock him away from Sonic.
Sonic: Tails, it's so good to see that you're back!
Tails: I've missed you too, Sonic! But wait, how long was I gone?
Sonic: About five years!
Tails: (shocked) Oh no! Half of the universe, including me were dead!
Sonic: (nods) Until Banner resurrected you by the Blip.
Tails: (noticed Sonic's shields) Whoa! Where did you get these shields from?
Sonic: Wakanda! It's technologically advanced!
Tails: It's such nice country! But who upgraded your shields?
Sonic: Donnie did!
They notice three Chitauri Gorillas approaching them.
Sonic: You ready, Tails?
Tails: You betcha, Sonic!
They began their Rolling Combo to take down several Chitauri Gorillas, Outriders, and Sakaarans.
Tails: All in a day's work!
Sonic: First of all. Let's put an end to Thanos and his mad campaign once and for all.
Jet and Lincoln started slashing off the soldiers with Caliburn before getting overpowered by Ebony Maw, who telekinetically using the debris to fight him until Wave and Storm arrive and kick him aside.
Storm: Hey, boss, it's good to see you!
Wave: Jet, we were searching you while we were in Babylon Garden.
Jet: It's a long story. You two were gone for five years since Thanos erased you two.
Wave & Storm: Five years?
Jet: Until the Hulk brought you guys back.
Storm: Anyway, who's this guy?
Lincoln: My name's Lincoln, Lincoln Loud!
Wave: Nice to meet you, Lincoln!
Storm: (shakes Lincoln's hand) Pleasure to meet you!
Lincoln: This is Caliburn!
Caliburn: Hello there! Anyhow, less conversation, more fighting! Let's get to work.
SpongeBob blowing his bubbles to trap the soldiers before being attacked by Proxima Midnight until Patrick and Sandy came to his aid by shooting ice cream cones and kicked her.
Patrick & Sandy: SpongeBob!
SpongeBob: Aw, you guys! You're back!
Patrick: How long were we gone?
Sandy: Yeah, SpongeBob! How long?
SpongeBob: Five years since Thanos erased you until Banner brought you all back.
The three hug with determination before returning to the battle.
Elsewhere, Star-Lord is seen fighting a bunch of Sakaarans with his quad blasters, killing all of them except one, which makes him fall over, but a off-screen shot kills him and he drops on Peter. Peter gets up and sees Gamora from 2014. Thinking its present Gamora, he is shocked.
Star-Lord: Gamora? (he approaches her) I thought I lost you.
Not realizing 2014 Gamora was the one from the present, Quill tried to kiss her before she grabbed him by the wrist, hurting him.
2014 Gamora: (she kicks him) Don't. Touch. (kicks him again) Me!
Quill falls from the pain, while 2014 Gamora wipes her face.
Star-Lord: (pained) You missed the first time. Then you got 'em both the second time.
Nebula comes into view.
2014 Gamora: This is the one? Seriously?
Nebula: The choices were him, or a tree.
Another part of the battlefield, Susie and her Robobot army are fighting many Chitauri and Sakaarans until Kirby in his Ultra Sword Ability came to her aid.
Kirby: Hey, Susie!
Susie: Hi, Kirby! You and your friends brought everybody back.
Kirby: Sure did! At least Bruce Banner did it.
Susie: He did?
Kirby nods.
Kirby: I might need a Robobot Armor if I need to fight all these monsters Thanos has summoned.
Susie: Well here you go! (she give him the armor)
Kirby hops in his Robobot Armor when it became his color before leaving Susie to fight the soldiers.
Susie: Good luck, Kirby!
Meanwhile, Hawkeye was running around the battlefield, still carrying the Nano Gauntlet while being chased by a Chitauri Gorilla before Plankton German Suplexes it until Falcon killed it with his wings while Raph did the same with his sais.
Hawkeye: Cap! What do you want me to do with this damn thing?
Cap throws Mjolnir to kill the monsters while holding an Outrider back with his broken shield.
Captain America: Get those stones as far away as possible!
Sonic: (grabs Mjolnir) And don't look back!
He punches an Outrider with his shield and Mjolnir before he gives Cap the hammer back before killing an Outrider and tossing it to Hulk, who punched it to a nearby rock.
Hulk: No! We need to get 'em back where they came from.
Leo slicing both Chitauri and Outriders at the same time.
Leonardo: What does that even mean?
Iron-Man: No way to get 'em back. Thanos destroyed the quantum tunnel.
SpongeBob: Scott, any news yet?
Ant-Man: Hold on! (He shrinks to normal size and pulls out a remote.) That wasn't our only time machine.
He presses the button, which activates Luis' van's horn, which is heard from afar. Hearing so, Cap and Sonic go to higher ground.
Captain America: Anyone see an ugly, brown van up there?
Sonic: Which it plays the horn which is La Cucaracha.
Valkyrie: Yes! But you're not gonna like where it's parked.
Rouge: By the looks of it. Those monsters are surrounding it.
Don scans the area where the van is.
Donatello: Which is where it's at the wrong place at the wrong time, obviously.
Iron Man: Scott, how long you need to get that thing working?
Ant-Man: Maybe ten minutes.
Captain America: Get it started. We'll get the stones to you.
Sonic: Good luck, you guys!
Wasp: We're on it, Cap. And thanks, Sonic.
SpongeBob: Let me and Plankton clear a path for you guys.
Plankton: With pleasure.
He picks up SpongeBob and blows into the head of his bubble wand, thus taking out the Outriders.
SpongeBob: Go for it!
Wasp: Thanks, SpongeBob!
Ant-Man: And you too, Plankton!
They both share a look and they shrink. Scott grabs Hope, and they fly to the van.
Doctor Strange traps a group of Chitauri in his magic and sends them through portals as Tony joins him.
Iron Man: Hey. You said one out of 14 million, we win, yeah? Tell me this is it.
Doctor Strange: If I tell you what happens, it won't happen.
Iron Man: You better be right.
Knuckles joins them.
Knuckles: So you must be the infamous Doctor Stephen Strange? Tails told me all about you.
Doctor Strange: You must be the guardian of the Master Emerald on Angel Island, Knuckles the Echidna!
Knuckles: You know it's quite a long story. Now let's get to the nitty gritty, shall we?
Iron Man: He's right. We must defeat Thanos once and for all.
Dr. Eggman in his Egg Dragoon is seen firing some nearby Leviathan and Necrocraft before being outnumbered.
Dr. Eggman: Guh! Help me!
Amy notices Dr. Eggman is in danger.
Amy: (over comms) Guys! Eggman is in trouble!
Sonic: Uh-oh! (he sees him about to get eaten)
Shadow stops and looks at Sonic for a moment. Silver, Lincoln, Caliburn, and Classic Sonic did the same. The Chaos Emeralds began floating around Lincoln, Caliburn, and the hedgehogs before transforming into their super forms. However, Blaze uses the Sol Emeralds to transform into Burning Blaze.
Burning Blaze: Let's go, boys!
Super Sonic: Hang in there, Eggman!
They fly to aid the doctor by killing several Leviathans and Necrocrafts using Spin Attacks, Kinetic Energy Pulse, Chaos Spears, Chaos Blast, Psychokinesis, Slashing, and Pyrokinesis.
Dr. Eggman: I have no time thank you guys for saving me anyway!
Super Lincoln: You're welcome!
Super Sonic: Glad we could do it!
Lincoln sees Metal Sonic being surrounded by Outriders, Chitauri, and Sakaraans, Lincoln flew in and sliced them to pieces.
Metal Sonic: So you must be Lincoln Loud, I knew you could do a super transformation.
Super Lincoln: It was from the Chaos Emeralds. And I could perform Chaos Control.
Metal Sonic: We have to land on one of Eggman's ships and take it to the skies.
Super Lincoln: On it.
They do so.
Elsewhere on the battlefield, Ant-Man and Wasp entering a small hole in the van's window, getting to the drive seat, regrowing and trying to activate the Quantum Tunnel.
Wasp: It's a mess back here.
Ant-Man: It's... it's dead.
Wasp: What?
Ant-Man: It's dead. I have to hotwire it.
Don arrives and analyzes the Quantum Tunnel.
Donatello: From the looks of it. It could use some upgrading right about now.
Wasp: Donatello, Scott is planning on hotwiring the Quantum Tunnel.
Donatello: Oh, I wish April could come and help us out literally.
Ant-Man: Me too, Donnie. But we've gotta fix the Quantum Tunnel.
Back at the battle, Thanos using his sword to kill one member of the Master of the Mystic Arts before worrying about Past Nebula.
Thanos: Where's Nebula?
Corvus Glaive: She's not responding.
Ebony Maw notices and points towards both Hawkeye and Mr. Krabs carrying the Nano Gauntlet, which gave Thanos his attention.
Ebony Maw: Sire...
Hawkeye and Mr. Krabs run across the battlefield with the Nano Gauntlet while killing Chitauri soldiers. Hawkeye shot one arrow and kills a Chitauri soldier while Mr. Krabs use his claws to take down an Outrider before they look to see Outriders and Chitauri Gorilla close in on them.
Mr. Krabs: Well it looks like the end of us.
They are saved by Black Panther, who landed and releases a kinetic energy pulse, taking them out.
Black Panther: Clint, Mr. Krabs! Give it to me.
Mr. Krabs: Here you go, T'Challa!
They hand the gauntlet to Black Panther. As he proceeds to run across the battlefield while taking out Thanos' troops. He continues to run and fight the monsters before releasing a kinetic energy pulse. However, Kirby in his Robobot Armor suddenly scans Black Panther's kinetic energy pulse before transforming it into Wakandan King's form before fighting several of the soldiers of Thanos. Moments later, Black Panther was taken down by Thanos' double-edge sword, which made him lose his grip on the gauntlet. Before the Mad Titan could charge toward the Black Panther, who was saved by an enraged Scarlet Witch, who's eyes are glowing red after remember the Mad Titan killing Vision.
Scarlet Witch: (enraged) You took everything from me.
Meta Knight flew next to her.
Meta Knight: So we meet at last, Thanos!
Suddenly, a huge amount of psychic energy was shot towards Thanos.
Super Silver: (flying next to the duo) I've been looking for you. You're the Infinity Trigger. Your actions will condemn us all.
Thanos: I don't even know who you are.
Scarlet Witch: You will.
Super Silver: My name is Silver. For the future of the world, I will destroy you!
Meta Knight readies his sword.
Meta Knight: Time to taste vengeance, Mad Titan!
Scarlet Witch uses her telekinesis to throw large pieces of rubble, Super Silver does the same, but Thanos evades them. The witch shot red hex bolts at the Mad Titan, and the super hedgehog did the same, but he block them with his sword until Meta Knight clashes Thanos with Galaxia. Kirby fought the monsters with his kinetic energy pulse before scanning one of Scarlet Witch's hex bolts as his armor transforms into Scarlet Witch form. Kirby using his telekinesis on the Chitauri before throwing a hex bolt at the Outriders. At the same time, Black Panther made another attempt to secure the glove before getting caught by Ebony Maw's telekinesis and restrained him from the concrete above the ground.
Spider-Man: I got it!
He uses his webbing before Black Panther gives Spider-Man the Nano Gauntlet as Jet and Karai close in on Ebony Maw.
Jet & Cream: Not this time, Maw!
They punch him, thus releasing Black Panther in the process before the Wakandan King was saved by Cream and Cheese, who are fans of him.
Cream: I gotcha, Mr. T'Challa!
Black Panther: Thank you, Cream, for saving me! And you too, Cheese!
Cheese: Chao!
Elsewhere, Spider-Man lands on the ground as a swarm of Outriders began to close in on him.
Spider-Man: Activate Instant Kill.
The eyes of his mask glow red just as the pincers on the back of his suit appear before repelling the Outriders coming toward him.
It looks like everybody is reunited, but the final battle has officially begun. Both armies are led by Captain America, Sonic, and Thanos are colliding in this epic moment in history.