Elsewhere, In a field far away from Gravity Falls, Dipper Pines wakes up and finds out that he is still in robot mode, only with blue eyes and in the form of an autobot.

Dipper: What the hell? (Looks at his Autobot-hand, then looks around the field) Mabel? Wendy!

Voice: We have been watching you a long long time.

Dipper, noticed by the voice, looks up in the sky and sees the legendary autobots Alpha Trion, Zeta Prime, and Rodimus Prime.

Rodimus Prime: You have fought for Optimus, our last descendant, with courage and sacrifice, the virtues of a leader.

Alpha Trion: A leader worthy of our secret. Your identity as a whole is not found. It is earned. Take the form of disguise, find your teammates, defeat Galvatron, but more importantly, save the ones you loved the most. It is, and always has been, your destiny, Dipper Pines.

The primes disappear in the sky.

Dipper: Optimus. (He then looks at the Field's distance) I gotta save Mabel.

Dipper runs through the field, following his destiny to save his friends from getting hunted by the decepticons.

Elsewhere in the ruins of Gravity Falls, medical assistance arrives to help those who were injured in the invasion. Mabel, Soos, and Wendy were being tended by medical assistance near an ambulance.

Mabel: I don't get it. The MP3 Player was the only way to set him free. How can it not work?

Soos: The decepticon probably took over his body completely.

Wendy: So what happens now?

Mabel looks at a picture of her and Dipper that she kept in her pocket. Tears roll down her face.

Mabel: Nothing. All we can do….is mourn my Dippingsauce.

Grunkle Stan is seen sitting on a rock, no longer feeling the pain he suffered. Tony Stark then comes to him.

Grunkle Stan: Why. Why didn't it work? Why didn't the plan free my nephew from the Decepticon's Body?

Tony Stark: Stan, I forgot to tell you this; once an hour passes by, the decepticon that controlled Dipper becomes immortal, meaning that it is able to take disguise and transform into any vehicle in any form.

Grunkle Stan looks down in grim.

Tony Stark: But don't worry. Dipper has been freed from the decepticon Blitzwing.

Grunkle Stan (looking up at Stark): Blitzwing?

Tony Stark: Only he has taken the form of an Autobot Endoskeleton. From there, he will take the form of disguise and catch up with the others, including the leader of this secret organization.

Grunkle Stan: Optimus. Well…should we find him?

Tony Stark: Don't worry Stan. By the time we meet up with Optimus and the others, you'll see your nephew again.

Suddenly, loud rumbling can be heard in the distance.

Tony Stark: Stand Back!

Grunkle Stan goes to meet up with the others as Tony looks on in the distance and the rumbling is heard again, but louder. People start panicking.

Tony Stark (getting out his phone): Any legion member assemble at Gravity Falls immediately. Decepticons are heading into the city.

Grunkle Stan meets up with Mabel, Wendy, and Soos.

Mabel: Stan, what's happening?

Suddenly, a loud explosion occurs near them, sending several ambulances flying and wiping out buildings as well. Stan, Mabel, Wendy, and Soos looked in front and saw Stinger coming through the smoke.

Grunkle Stan: They're still here! We have to go NOW!

Grunkle Stan, Mabel, Wendy, and Soos ran for it as Stinger was continuing to destroy the town. He then set his sights on Stan and the others.

Stinger: There they are.

Stinger chased after the 4 helpless heroes as they tried to escape. Stinger began to send various cars to them, which they easily dodged, until Soos got his leg stuck in a tree branch.

Soos: Agh!

Wendy: Soos!

Wendy tried to save Soos, but Stan stopped him.

Grunkle Stan: Wendy No!

Soos tried to escape from the tree branch, but was too late as Stinger caught up to him and grabbed him. Soos tried to let go of Stinger's Grip as Stinger investigated him.

Soos: No! Get away from me! Agh!

Stinger: What a pity. Seeing the flesh of mankind.

Stinger takes aim at Soos and shoots him down, killing Soos instantly.

Wendy: NO!

Stinger drops Soos's body to the ground and reset his sights onto the 3.

Grunkle Stan: Wendy Come On! Let's Go!

The 3 made a ran for it to the hospital as Stinger continued to hunt them down. They entered the hospital.

Grunkle Stan: Everybody Get Dow-

Out of nowhere, Stinger made a huge blast through the door, sending Stan, Mabel, Wendy, and several Hospital employees flying into the walls. Gideon and Robbie hear this from their hospital beds.

Robbie: They're here. Let's Go! Hurry!

Robbie and Gideon escape from their beds to go meet up with Stan and the others. Stan meanwhile looks in pain as Stinger approaches them. He picks up a helpless Stan as Mabel and Wendy in horror.

Mabel: STAN!

Stinger: Grunkle Stan. What a pleasant surprise.

Grunkle Stan: You're Not welcome here. None of you idiots of your kind are welcome here!

Stinger: Is that so? Well then, I guess I'll have to do the unthinkable.

Stinger ignites his blaster and aims it at Stan, preparing to shoot him down.

Mabel: No!

Suddenly, Tony Stark, in his Iron Man costume, intrudes the hospital and punches Stinger hard, letting Stan go from Stinger's grip. Mabel and Wendy come over to Stan's aid as Stinger turns his focus to Iron Man, who aims at Stinger in battle position.

Stinger: Tony Stark. I didn't know you were gonna be here tonight.

Iron Man: Party's over hotshot.

Behind Stinger, the rest of Stark's Legion arrives in Peter Quill's Starship: Thor, Captain America, Hawkeye, Black Widow, The Incredible Hulk, Spider-Man, Mario, Luigi, Yoshi, The Guardians Of The Galaxy, Hiro Hamada, Baymax, GoGo Tomago, Fred, Honey Lemon, Wasabi, Star Butterfly, Marco Diaz, Mega Man, and Jack Nightshade, A 14 Year Old Swordsman.

Stinger: This was your plan all along huh?

Iron Man: Judging by what I've broughten over? Yep. That be it.

Stinger: And no Autobots to join your group huh? What a pity.

Iron Man: You sure? Well then what's that?

Stinger looks at a random direction, and out of nowhere, a Yellow Chevrolet Camaro crashes through the Hospital walls and runs over Stinger's foot, knocking him to the ground. It transforms and it turns out to be Bumblebee, the young autobot scout.

Mabel: Whoa!

Wendy: I was expecting a giant Avenger!

Stinger gets up.

Stinger: IMPOSSIBLE!

Stinger and Bumblebee go at it as Gideon and Robbie enter the scene.

Gideon: What the Hell?!

Robbie: Stand back! Stand Back!

After a lengthy battle, Iron Man shoots Stinger through the chest, allowing Bumblebee to get the upperhand and shoot Stinger through the head twice, killing Stinger instantly.

Bumblebee (Holding Stinger's Head): I Hate cheap knockoffs.

Iron Man lands to the ground as Stan, Mabel, Wendy, Gideon, and Robbie exit the hospital.

Grunkle Stan: So…This is the company you've been talking about.

Iron Man: Hey, what else would you expect? The Justice League?

Another loud rumble is heard.

Mabel: There's more coming!

Iron Man: Quick! In the starship!

Stan, Mabel, Wendy, Gideon, Robbie, and Iron Man enter the starship while Bumblebee transforms into his vehicle mode and enters the ship as well. The starship takes off as more decepticon drones destroy the hospital and look as the starship escapes into the distance.