Above the ruins of the New Avengers Facility
Super Lincoln and Caliburn are fighting the monsters on one of the Eggman Fleet. However, Classic Tails provides assistance to the duo while on Modern Tails' plane.
Super Lincoln: Hey, you must be Classic Tails! Tails' classic counterpart.
Classic Tails: It's nice to meet you, Lincoln Loud!
Caliburn: My name is Caliburn! Very well then! No time for introductions! Let's just get on with the battle!
Super Lincoln & Classic Tails: Right!
They flew off somewhere in the skies.
Back on the ground
The reunited Mage Sisters fighting the Outriders and Sakaraans before nearly being overwhelmed by three Necrocrafts until Kirby in his Robobot Armor, which is in Scarlet Witch form using his bolts to destroy them before meeting up to the trio.
Kirby: Zan Partizanne, Flamberge, Francisca! It's good to see you three again! (hugs them)
Zan Partizanne: Good to see you too, Kirby!
Flamberge: Same here!
Francisca: Me three! Anyway, Captain Marvel should be on her way soon.
Kirby: She will be. Now let's fight to save the universe from Thanos!
They nod.
Elsewhere on the battlefield, Super Silver, Scarlet Witch, and Meta Knight are still fighting Thanos while holding his double-bladed sword from slicing them until Wanda breaks the sword before she and the psychic hedgehog lift him up in the air before Meta Knight approaches him.
Meta Knight: Any last words, Thanos?
Thanos: Rain fire!
Corvus Glaive: But sire, our troops!
Thanos: (pained) Just do it!
Meta Knight: (looks up in the air) Oh, no! Let us make haste! (he escapes)
In the air, the Sanctuary II aim its energy cannons and fire a hailstorm of missiles on the battlefield. As the missiles fire, casualties on both sides, including the Waddle Dee, Eggman Robots, Jellyfish, and Meta Knight's Army.
SpongeBob: TAKE COVER!
Scarlet Witch and Super Silver try to block to the missiles before being blown aside, ending their assault on the Mad Titan before Mikey came and caught Wanda.
Michelangelo: You okay, Scarlet Witch?
Scarlet Witch: Of course, Michelangelo! We need to take shelter!
Michelangelo: Now let's continue fighting the bad guys.
As they take off during the missile attack.
Super Sonic: (sees his friends in danger) Tails, Amy! Get out there!
Iron-Man grabs them from the attack.
Tails: (in awe) Thank you, Tony Stark!
Iron-Man: Hey, you must be Tails? I've heard a lot about you.
Tails: I know. I like all your technology.
He gestures a thumbs up before Amy starts to speak.
Amy: Guys, look! (points to something)
At the moment, Wong and the Masters of the Mystic Arts summon Tao Mandalas and Super Silver using his Shield of Light to protect their army from the attack. Metal Sonic uses his Black Shield to protect himself from harm. Seconds later, Rescue sees one of the missiles hit a nearby dam.
Rescue: Uh, is anyone else seeing this?
The psychic super hedgehog sees it.
Super Silver: I got this.
As Silver attempt to stop the water. However, Doctor Strange looks at the broken dam and uses his magic to stop the water from flooding the battlefield before looking at Silver.
Doctor Strange: Don't worry, Silver. I've got this covered. Now go help the others.
Super Silver: Thanks for the tip, Doc.
He flies off.
Meanwhile, Kirby notices the Sanctuary II began is attack before the Halberd and the Egg Fleet struggling to fire at the giant ship's cannons.
Kirby: Come on, we have to attack the ship's core.
At the moment, King Dedede, Bandana Dee, Blade Knight, and Sword Knight form activate the Friend Star ability before Kirby scans the Capsule J3, making it Jet Mode before flying off to the Sanctuary II. However Classic Super Sonic joins the fray before Super Shadow joins.
Super Shadow: Here we go!
As they go inside the ship, Shadow fires his Chaos Spears at the Leviathan, killing it in the process. Kirby shoots down the Necrocrafts before destroying the Chitauri. King Dedede, who is piloting the Friend Star shoots stars at the monsters before switching to Bandana Dee to fire at the enemies. Classic Super Sonic performs his Spin Attack on the Sakaraans before flying off.
Kirby: (points at the core) There it is! The core! Let's destroy that thing!
Super Shadow: Time to take it to the max!
King Dedede: All right!
As they proceed to attack the core of the Sanctuary II before flying back to where they came in from.
Meanwhile, Spider-Man is starting to get overpowered by the Outriders while protecting the Nano Gauntlet.
Spider-Man: I got this. I got this! Okay, I don't got this. Help! Somebody, help!
Amy and Knuckles spot the Web Slinger being outnumbered.
Knuckles: Uh, Cap!
Amy: Spider-Man's in trouble!
Captain America: (notices his fan in trouble) Hey, Queens, heads up.
As he throws Mjolnir, and Spider-Man shoots a web to get away from the monsters while holding the glove and glides along until a missile blast made him lose his grip before Charmy makes the save.
Charmy: I got you now.
A missile blows the two before Rescue grabs them.
Rescue: Hang on. I got you, kid. (She throws him on Valkyrie's Pegasus Aragorn)
Charmy grabs onto the leg of Peter's armor.
Spider-Man: Hey! Nice to meet you... OH, MY GOD!
Charmy: HANG ONTO THE GAUNTLET!
Both Rescue and Valkyrie help Charmy and Spider-Man get closer to Luis' van until a missile blast blasted the two off of Aragorn before Patrick catches them.
Patrick: Gotcha! Come on, let's get that big glove to the van right away!
They nod with agreement before grabbing the Nano Gauntlet. The three along with the Avengers' army is then pinned down by the airstrike.
As we await for the arrival of Captain Marvel, who would turn the tide for the army of to gain momentum before getting rid of the Infinity Stones for good.