Hi, guys! This will just be a short story I decided to write up since the events of Loki and No Way Home. This will take place after Sylvie has killed He who Remains, to give you a heads up. Ever since Phineas and Ferb: Mission Marvel happened, I didn't think what it could mean in the future, until now… Now that the Multiverse is broken beyond repair, anything is possible…

"Stacy, did ya see what Jeremy posted last week on his Snapchat?" Candace was laying on her stomach kicking her legs back and forth, gleefully talking to her friend from her laptop. "I know right?! I can't believe it! That new dog of his is beyond cute!" The orange haired 16 year old rested her hand on her cheek, currently in a bright and cheery mood. Linda Fletcher and her husband were both currently at their work as the kids were home by themselves. Phineas and his brother, Ferb, were currently working on their Beak suit making some major upgrades in case anything happened. The Beak was currently in need of repairs from their last battle a year ago, after teaming with Spider-Man and the Avengers. "Hey, guys! Whatcha doin?" Isabella popped in from outside the garage with her hands tied behind her back. "Oh, hey Isabella! We're just working on our Beak suit, but we don't have anything else planned which is weird for us." Phineas and Isabella fist bumped each other before she greeted Ferb. "Oh, cool! Have you considered making a suit like that for me? Except with a FireSide Girls paint job? I do need a superhero badge, and I haven't gotten one yet. I thought for sure helping out the Avengers and Spidey would grant me one." Phineas patted her on the shoulder and gave her a smile. "Tell you what. I'll think about it! Ferb and I still have a lot of other projects on our minds so it'll be a while!" Isabella lit up and her smile turned into a big grin. "Excuse me, Phineas.." She ran out of the garage and began squealing excitedly that Perry put on a pair of earmuffs. As soon as she was done, Isabella walked back into the garage. "Sorry, really bad allergies, guys. Do you mind if I grab a glass of water?" Ferb nodded silently as Phineas was testing out the suit's mechanics. Isabella walked inside their house and began to skip over to the water dispenser out of the boys' gaze. Suddenly, the house starts to shake almost violently and Isabella grabs on to the kitchen counter. "What's going on?! Is this an earthquake?!" Candace tries to run down while holding onto the staircase. "What are Phineas and Ferb doing now?! Isabella turned to look at her with a horrified look. "It wasn't them! None of this is our doing!" Candace ran over to Isabella and took her hand, guiding them to under the kitchen table. Everything came to a sudden stop as the girls came out from under the table, and sprinted over to the boys. "Phineas! What happened?! What did you boys do this time?!" Phineas and Ferb both had worried looks on their faces. "Candace, it wasn't us this time! We swear! We were just working on the Beak when the garage started shaking like crazy!" Candace could tell they were telling the truth since she's done this for years, and embraced her brothers. "Allright, at least we're all safe..maybe the news will tell us what happened just now.." Candace, Isabella, and the boys sprinted over to the TV in a hurry, turning it on to the news.

"This is breaking news!" The kids' eyes widened and sat down as they were fixated on the TV. "We come to you now with last week's attack in London. An anonymous source provided the following video, it shows Quentin Beck AKA Mysterio, moments before his death. Warning, you might find the following footage disturbing." Candace and Isabella looked at each other with confused looks, so did the brothers. "Is this right? Nothing about the earthquake?" They continued to listen, not turning away. A man with scars on his face, wearing a green and yellow armored suit of some kind. "I managed to send the Elemental back into the dimensional rift, but I don't think I'm gonna make it off this bridge alive. Spider-Man attacked me for some reason." Phineas, Ferb, Candace and Isabella all looked at each other with much more confusement. "Spidey will never do that… It can't be true." Candace said to herself with worry in her voice. "He has an army of weaponized drones, Stark technology. He's saying he's the only one who's gonna be the new Iron Man, no one else!" Candace's heart sank as if one of her brothers died. "...New Iron Man? What does he mean by that?" A new clip is shown on the TV showing a different looking Spider-Man than the one they met. "Are you sure you want to commence the drone attack? There will be significant casualties. Do it, execute them all."
The kids are just dumbfounded by what they just saw with their eyes. "This shocking video was released earlier today on the controversial news website ." A bald, yet handsome middle aged man with a mustache came on the screen. "There you have it folks, conclusive proof that Spider-Man was the brutal murderer of Mysterio. An interdimensional warrior that will no doubt go down as the greatest superhero of all time! But that's not all folks, here's the real blockbuster! Brace yourselves, you might wanna sit down!" Candace, Phineas, Ferb and Isabella were already on the couch, but the brothers were holding their sister's hands as she was looking distraught and betrayed. She was shaking.

"Spider-Man's real…..Spider-Man's real name is…. Spider-Man's name is Peter Parker!"

The TV screen shows the face of a 16 year old high school teenager smiling, as everyone's jaws drop open. Candace felt a break in her heart as she felt betrayed by her favorite superhero. Phineas slowly stepped over to his sister and placed a hand on her shoulder. "Candace, maybe it's not what it seems. I know Spider-Man wouldn't do that…or Peter Parker.." Isabella wiped a tear from her eye while Ferb patted her on the back. "I just feel something isn't right here…" Candace sniffled looking up at Phineas. "There's no way Spidey would do that, right?"

Buford and Baljeet suddenly came bursting through the door to the garage. "GUYS! Iron Man is DEAD!" Everyone's eyes widened, and Candace's heart sunk again. "What?" Baljeet had a magazine in his hand that showcased a different version of Iron Man than they had known for a while. "I think we're in an entirely different universe.." Candace ripped the magazine from Baljeet and opened it up. "Guys? It says his death was a sacrifice in order to defeat… Thanos?...Who is Thanos?" The room grew silent, you could even hear a pin drop.

Phineas sat back down on the couch. "I think I know what we're going to do today, guys.."

Well, that is it…in case you guys want more. Thanks to Loki, I think Phineas and Ferb are an official part of the MCU multiverse. The inspiration for this was from a few years ago, before Mission Marvel, and before the multiverse was a thing. For some odd reason, I always loved to see Phineas and Ferb meet the Avengers, or Raimi's Spider-Man characters, like Doc Ock. But now due to the multiverse, I think it can be arranged.

Let me know!