The trailer starts with the cross slash, and then...
Inkopolis Square, just like when you start Splatoon 2. the camera zooms in on the big TV on top of the tower as
this song plays:
Pearl: Y'all know what time it is!
Marina: It's Off the Hook, coming at you LIVE from Inkopolis Square!
Pearl: Hey, Marina, did you hear?
Marina: Hear what?
Pearl: The Super Smash Bros. tournament is ending soon! They're gonna bring in their last newcomer today!
Marina: It's hard to believe it's finally coming to an end... just like when we did our last Splatfest...
Pearl: Say, remember when we had a Smash Bros. themed Splatfest?
Marina: Heroes vs Villains! And I'll remind you that Villains won!
Pearl: Doesn't look like it on the Smash side of things...
(The screen behind them shows the new DLC heroes and villains on either Pearl or Marina's side. Heroes on Pearl's side, Villains on Marina's side. Pearl's side lists Joker, Hero, Banjo & Kazooie, Terry, Byleth, Min Min, Steve & Alex, and Pyra/Mythra. Marina's side has Piranha Plant, Zombie & Enderman, Sephiroth, and Kazuya.)
Pearl: In the end, Heroes win, baby! BOOYAH!
Marina: No need to gloat, Pearlie...
(the image on the TV behind them changes to static)
Pearl: Ayo, what's going on?
Marina: Hold on, it's coming in...
(
This song plays as an image of the Smashers looking at Galeem and Dharkon fighting in the sky appears)
Marina: Looks like Smash is in trouble!
Pearl: Holy carp, Marina, WHAT DO WE DO!?
Marina: The only thing we can do...
(Marina pulls out something from behind her. They're two Smash Invites)
Pearl: Are those... THE LAST SMASH INVITES?! And they're for two?!
Pearl: Does this mean...?!
Marina: As much as we'd like to join Smash, we have a career to keep up here. We can help, but...
Marina: It should go to someone who deserves it more. And I know just who....
Pearl: And that’s all the time we’ve got!
Pearl: Until next time…
Pearl & Marina: Don’t get cooked! Stay off the hook!
(The scene changes to the Final Battle area of World of Light as
this song plays. We see CGI of various Smashers fending off Galeem and Dharkon-created clones of themselves, like Min Min fending off her Galeem clone and Kazuya attacking his Dharkon clone. It then cuts to Off the Hook's helicopter in the distance. The camera changes POV as if it were the newcomers'.)
Marina: Sorry to get you two on such short notice... just help the others until Pearl's ready to do her thing! I’ll provide some backup with my Hyperbombs!
Pearl: I gotta do this AGAIN? Oh well... go save the world again, Agent 8! Both of you!
(The camera changes to show female and male Agent 8 holding the Smash invites before going into Octopus form and jumping to the others as
this plays. As they're about to land, around 0:11 in the song, they go back to their humanoid forms and you see this title card: )
Octoling Paints the Town Pink?!
(the text fade in effect also resembles the mission descriptions at the start of each OE level, including the final level)
(Gameplay consists of the Octolings using their various weapons against Galeem and Dharkon-created clones of the fighters, including DLC. Some such shots include a Dharkon clone of Cloud and a Galeem clone of Sephiroth at the Northern Cave; a Galeem clone of Pyra and a Dharkon clone of Terry at KoF Stadium, and a not clone, but Galeem possessed (aura only) Yellow and Green Inkling on Octoling's stage, MC. Princess Diaries. this is a throwback to Hijacked Agent 3. After a CGI shot of both Octolings detonating a series of Hyperbombs that demolish most of the clones, MC. Princess Diaries' stage gimmick is also shown: after two minutes pass, Pearl descends from the sky and whomever approaches her gets her to use her Princess Cannon. it has a larger radius than Inkling's Killer Wail final smash. also, Octoling's final smash, Booyah Bomb, is shown off at some point prior.)
Super Smash Bros. Ultimate
X
Splatoon 2: Octo Expansion
cut back to CGI. Galeem and Dharkon begin charging massive blasts of energy as
this plays. The Octolings run back to the other Smashers, making uneasy noises when the song cuts to 0:23 and Pearl leaps from the sky in front of the Smashers.
Pearl: Y'all did great. I'll take it from here!
Pearl: Vocal chords ready!
Pearl: AYO, LIGHT AND DARK THINGIES!
(Pearl's hair glows pink AND she has the Final Smash Aura. She's an Inkling, so I guess Smash-verse is just treating her as an Inkling with the Princess Cannon as her Final Smash. She whips out the Princess Cannon, Galeem and Dharkon fire, and then...)
Pearl: BOO-YAAAAAAAAAAAAAAAHHHHHHHHHHH!!!
(the next scene folds out exactly
like this, with the fluctuating bars and finishing much the same way, only difference is the the "Good Guys" bar has a rainbow wave left-to-right effect, and "Bad Guys" has right-to-left waves of yellow and purple.)
(As Galeem and Dharkon die and fall into the ocean,
this plays. You see the balls of yellow and purple light before they burst into the Spirit-spout reaching into the sky. All the Spirits are finally going home. This is World of Light's true ending.)
(Finally, one last CGI to send Smash Ultimate off. It emulates the credits sequence of Octo Expansion, but with all the smashers (incl. different gendered/different character alts like the Heroes if any) standing on the cliffs watching the Spirit spout, and Pearl and Marina performing
Into The Light on the little portable stage carried by their helicopter. A holographic screen appears a few seconds in, showing the Super Smash Bros. Ultimate title, and key segments of each trailer in reverse order:
Octoling -> Kazuya -> Pyra/Mythra -> Sephiroth -> Steve/Alex/Zombie/Enderman -> Min Min -> Byleth -> Terry -> Banjo & Kazooie -> Hero -> Joker -> Piranha Plant -> Ken & Incineroar -> Isabelle -> King K. Rool -> Dark Samus -> Chrom -> Simon & Richter -> Ridley -> Daisy (as part of Everyone Is Here) -> Inkling
then Smash 4's trailers in reverse order:
Bayonetta -> Corrin -> Cloud -> Ryu -> Roy -> Lucas -> Mewtwo -> Duck Hunt -> Bowser Jr. -> Shulk -> Lucina & Robin -> PAC-MAN -> Mii -> Palutena (and Dark Pit) -> Greninja -> Little Mac -> Rosalina & Luma -> Wii Fit Trainer -> Mega Man -> Villager
then at the synthwave part of the song, the Brawl reveals (idk the order but reverse em). At 2:52 in the song, as Marina sings again, you see the segments of the Melee intro with Melee's newcomers, then 64's intro with all its newcomers. At this point, the sky changes to the morning light as it was previously night. The last thing on the holographic screen is one final marquee of the completed Smash Ultimate banner before the holographic screen fades away as the song ends, everyone looks back at the viewer, and the camera slowly pans up to the sky where the Spirit-spout ends.)
Thanks for playing!