The trailer starts out on the Title Screen of The Legend of Zelda on the NES, simulating a normal playthrough, the hypothetical player in charge of the trailer selects his one and only save file “Link”.
Link starts off in a cave, and quickly leaves it to enter the overworld, in its 8-bit flair and all. Link ventures through the plains of Hyrule, going through the usual enemies, more specifically the typical Moblins and Octoroks. He goes up 5 screens and goes right, then defeats the Tektites in the screen. At last, Link breaks the rightmost piece of the wall on the rock in the middle with his bomb and enters the iconic big rock.
Though, curiously, there is no old man waiting for him. Instead, the screen is black, and suddenly lights up into a room that resembles a dungeon, with skulls as its walls and a bridge in the middle of the room. There is an eerily familiar feel, yet it's an unfamiliar setting nonetheless. In contrast to earlier, when the overworld was jamming with the iconic overworld theme from the original Zelda, there's an ambient silence now. The graphics then transition from the iconic 8-bit style to the usual CGI that Smash trailers tend to use.
Link, in his classic costume, looks around himself, worryingly staring at the skulls around him, as he senses a presence. He then looks over the bridge and notices a shadowy figure in the distance. As the camera closes the gap on said figure, the typical Kabuki sound effect that most people are familiar with plays out silently, as if the sound comes from a distance. The shadowy figure runs to Link and unsheathes his katana and blows a rapid strike, similar to the quick-draw techniques you often see Samurai perform in media. With Link barely being able to shield himself from the strike, he lays on his right knee and takes a second look at the shadowy figure, now behind him. The figure takes his katana and lifts the blade right to his own face, a pose that might be familiar to some, as the dim light gets reflected his identity becomes much more clearer. The Mysterious Murasame Castle Medley starts to play as he rotates his sword to reflect the light on his face, and at the 8 second mark of the track the figure's splash screen comes up with the tagline:
"Takamaru Slashes His Way Into Smash Castle!"
Link has a good look at his opponent now, he stands up firmly and accepts the challenge!
During this gameplay bit, the rest of the medley plays. We see our two fighters on the newly introduced Murasame Castle stage, with Link and Takamaru facing against each other. The stage gets shown off at this part with various shots, the ninjas being the stage hazards get shown off as well. The battle commences shortly after. Most of Takamaru's moveset gets shown here, from his Neutral Special, the Windmill Swords, to his Side-Special, Iajutsu Rush. After a short battle with Link, but with no winner yet, the battle transitions to showing off Marth, Roy, Shulk and Sephiroth in a Truck Motion with Takamaru later beating Marth, Roy and Shulk with his various attacks and using his Down-Special, Quick-Draw Counter, to finish off Sephiroth as a response to his huge Forward Tilt. After the sudden intermission, he then taunts by dusting off his Hakama Pants (Left Taunt). As Link jumps back in action, Takamaru responds with his Up-Special, Ring Slash. And then proceeds to finish up Link with his Final Smash, Inazuma Rush. The trailer goes back to CGI.
The medley ends, and the audio goes back to the ambient silence from before. With Link blown away in a wall of skulls, there are sudden rumblings within the dungeon, and a loud roar dominates both fighters' environment. The dungeon crumbles down as the final boss of The Mysterious Murasame Castle, Murasame, breaks the upper walls and enters the room. Takamaru and Link, who is visible in the background sitting in a pile of skulls, look at the doglike beast, and then look at each other in the eyes. Takamaru stands in his iconic pose, readying himself for battle against the gigantic beast. An in-game shot of Takamaru facing against Murasame appears, confirming the latter to be a boss for Infinite. A shot of Takamaru striking the boss then freezes and transitions to ink. The crossover card gets shown off, while another Kabuki sound effect plays when The Mysterious Murasame Castle Theme title appears:
As our little post-trailer scene, we have a patched-up Link and Takamaru enjoying some Eastern delicacies in a Yatai (Japanese Eating Stand) in the Village. As the Ending Theme of Takamaru's game plays, the duo seem to have made up and patched up their differences from their recent misunderstanding, and they certainly seem to be enjoying their hot takoyaki.