A day in the Loud House can take turns that no one expects. And yet, with 10 sisters each having their own quirks, having more to Lincoln Loud's life would just be normal for him. Until that one faithful day when things just got bigger. For after the Loud kids' wacky adventure on Bird Island with Kirby and his friends, Lincoln and his sisters relaxed at the Loud House with their three Angry Birds and their three Eds. At the backyard, the gang spend their summer by cooling off on the kiddie pool while Eddy performs his swan dive on the roof of the Loud House.
Eddy: Ladies, Birds and Gentlemen! I will now perform a swan dive in this kiddie pool from the rooftop of the loud house! (Eddy performs his swan dive incorrectly and makes a big splash on the pool.) Tada!
Red: (sarcastic) Perfect swan dive, Eddy. Almost makes me want to spare mercy on you for getting us wet.
Ed: (shivering) Cold!
Lincoln: Careful, Eddy! That pool is fragile. Remember the last time I did a cannonball on the pool once?
Eddy: Relax, Lincoln. We been through the ice age, you guys destroyed the green pigs's houses, and now we are spending a relaxing day in the loud house with no problems at all.
Lori: Yep, just one day without any trouble.
Lisa: Uh…. that reminds me.
Double D: What is it, Lisa?
Lisa: When we got back home, I decided to dab into the theory of how our world is connected to different universes.
Eddy: Like the Ice Age and Bird Island?"
Lisa: Correct. I'm making a universe portal, which can take us anywhere. It's like the Time Cube, except bigger and not a cube. I call it, "The Multi-Portal."
The Eds: Cool.
Red: A Multi-Portal, huh?
Lisa: It's true. After our adventures, I created the Multi-Portal as an alternative to the Time Cube.
After Lisa explains about the Multi-Portal, something was on the news on the tv at the living room.
Dad: KIDS AND GUESTS, COME CHECK THIS OUT ON TV!
The gang rushes to the living room and saw some monster attacking the golden gate bridge in San Francisco.
Leni: What is that thing?
Ed: That looks like the creature from one of my favorite guilty pleasures ever, "San Francisco Kaiju Attack."
Bomb: Yep, except this time, it's for real.
Eddy: Wait a minute. That's where Riley was in San Francisco! What if she's there getting crushed by that monster?
Double D: I'm sure she's alright, Eddy.
Eddy: Yeah, I hope she is.
Lori: It can't be. It must be a joke.
Luan: Come on, Lori, everything's Golden today. Does anyone ever get my joke?
News Reporter: This just in. The monster that is attacking the bridge is not a joke.
Lincoln: Oh man, they're not kidding. But how did the monster show up?
Eddy: Probably an organization that hates bridges.
Lynn: It's definitely too big for the closet or under the bed.
Red: Well, whatever it is, we need to find the source of the monsters and take it out.
Chuck: But how?
Double D: Maybe those monsters aren't from our world. Someone must have made their own universe portal to send the monsters to our world?
Red: Of course, they came from another world. But whoever brought them here, I'd like to give him a knuckle sandwich.
Eddy: Maybe we can use the Multi-Portal that Lisa built, so we can find the monsters and destroy them in their world.
Double D: I don't know, Eddy. What if we get stuck in that universe like when we got stranded in the Ice Age?
Eddy: Look, sockhead, I ain't letting no monster hurt Riley in her new home! We have to do it!
Lincoln, the girls, Ed, and the Angry birds: Yeah!
Double D: Well, I suppose I could…
Ed: Monster hunting, guys! Time to start the Multi-Portal!
Lisa: I'm on it. (turns on the portal)
Lincoln: Better bring the Time Cube along. Just in case.
As they change from their swimsuits to their original clothes, the Loud Ed-Flock was ready to save their world. Suddenly, as the portal turned on, it picked up some disturbance.
Eddy: Hey, what's going on?
Bomb: I didn't press any buttons, guys. I swear.
Double D: It appears that the Multi-Portal is picking up something from another world.
Chuck: If it's that monster we saw on TV, we're toast.
Lisa: Negative. It's from another world.
Out of the portal were three figures, along with creatures shrouded in black. One figure was a human boy, the others were a duck and a dog. They were the Ed's' old friends, Sora, Donald, and Goofy. The Heartless had landed beside them.
Eddy: What the?
Red: Uh, we said we have to go to the portal, not pick up some uninvited guests.
Lisa: I was getting the portal started, but it got these people instead.
Sora: Ugh, where are we?
Goofy: Looks like a normal house to me.
Donald: It is a normal house.
Double D: Sora, is that you?
Sora: Double D? It's been a long time, old friend.
Red: Wait, you know him?
Leni: Uh, can this conversation wait? Like, I think these black thingys want us.
The Heartless began to attack the gang, when Sora, Donald, and Goofy fended them off with their weapons.
Chuck: Whoa, you guys are amazing!
Luna: Thanks, dudes!
Sora: Don't mention it.
Red: So, about these people, Double D?
Double D: Well, Ed, Eddy, and I were great friends with them back before we met the Loud kids.
Eddy: Sockhead's right. We've been on so many adventures, like when we helped Tony Stark battle his former mentor, Obadiah Stane, from using the iron suit as a weapon.
Ed: Don't forget the time we defeated Maleficent and the Decepticons from ruling the world.
Leni: Didn't Maleficent have a daughter named Mal? Or when she, like, was the hero and Aurora's father was the villain?
Eddy: She was never the hero nor had a daughter!
Double D: What were you three doing before the Multi-Portal picked you up?
Goofy: Well, we were fighting the Heartless like we always do when we got sucked into a comfortable little house.
Donald: How did this happen?
Lincoln: Well, Lisa created the Multi-Portal to take us to the universe where that monster came from.
Goofy: What monster?
Lucy: This. (turns on TV which shows a new report of the monster attacking San Francisco)
Sora: Whoa, that doesn't look like a Heartless. Where did it come from?
Lisa: That's why I built the Multi-Portal, to find out where the monster came from.
Donald: Well, what are we waiting for? To the Multi-Portal!
All: Yeah!
So, our heroes went into the Multi-Portal to find out where the monster came from.