Stark Tower was larger in person than in photographs.
Naruto had seen it in the library — images pulled from news articles, aerial shots, the distinctive architecture of a building that had been designed to announce its own significance. In photographs it was impressive. Standing at street level looking up at it with the actual physical scale of the thing pressing down on his perception, it was something else entirely.
He stood at the east entrance with Peter beside him and tipped his head back and looked at it the way he had once looked at the gates of the Hidden Cloud Village as a young man — with the specific alertness of someone entering a structure of significant power that was not yet sure whether it considered you a guest or a problem.
"Big," he said.
"Yeah," Peter agreed. "First time I came here I walked into a glass door."
A large man was waiting at the east entrance — broad, tired-looking, wearing an expression that communicated a comprehensive acceptance of his life's peculiarities. He looked at Peter. Then he looked at Naruto. Then he looked at the space between them with the expression of a man updating a list in his head.
"Happy Hogan," Peter said. "He works for Tony."
"I drive for Tony," Happy said, in the voice of someone who had made this correction many times. "And provide security. And occasionally—" He stopped. "It's complicated." He looked at Naruto. "Who are you?"
"Naruto Uzumaki."
Happy looked at Peter.
"Long story," Peter said.
"They're always long stories," Happy said, and held the door open.
The elevator was fast and silent and made of materials that suggested expense in a way that didn't need to announce itself. Naruto watched the floor numbers change and catalogued the building the way he catalogued every space he moved through — entry points, exit points, structural features, the positions and movement patterns of the three security personnel he had noted between the entrance and the elevator.
Good security. Attentive, varied patrol patterns, equipment that looked functional rather than decorative. Someone had designed this operation thoughtfully.
"FRIDAY will scan you when the doors open," Peter said. "Tony's AI. She'll run biometrics, check for weapons and energy signatures. It's automatic. Don't — it's fine, it's just what she does."
"I know about the AI," Naruto said. "I read about her."
"Right. The library thing." Peter paused. "You really just — went to a library. On day one."
"Day three, technically. Days one and two were survival and orientation."
"And day three you thought, library."
"Information is a resource. A shinobi without information is a shinobi walking into the dark."
Peter appeared to consider this. "That's actually—"
The elevator opened.
The space beyond was large, bright, and occupied by technology in every direction. Screens covered one full wall, displaying data feeds in multiple formats — atmospheric readings, energy signatures, news streams, structural analyses of things Naruto couldn't immediately identify. Equipment filled the floor space in organized clusters, some of it recognizable from the library images, most of it not. The ceiling was high enough to feel like the outdoors, and the windows beyond the workspace gave a view of the city that recontextualized everything Naruto had seen from street level.
Tony Stark was standing at a central workbench with his back to the elevator, doing several things simultaneously in the manner of someone whose hands operated independently from his conscious attention. He was wearing dark clothing with the sleeves rolled up, holding a tool of some kind in his right hand and a coffee cup in his left, and his eyes were moving between three screens arranged in a shallow arc in front of him.
He did not turn around.
"FRIDAY," he said.
"Scanning," a voice said — clear, female, present in the air around them rather than from any specific point. "Subject one: Peter Parker. No anomalies. Subject two—" A brief pause, fractionally longer than a normal processing pause, the kind of pause that meant unexpected results. "Subject two is generating readings I don't have a classification for. Biologically human. Baseline enhanced — spider-gene markers present, Uzumaki genetic line confirmed. But there's something else. Energy signature in the chakra pathway system — I don't have a reference file for this energy type. And there's a secondary signature underneath it. Dormant but measurable. It's — Mr. Stark, it's adjacent to the Infinity Residue readings you've been monitoring."
Tony turned around.
He looked at Naruto for approximately three full seconds without speaking, which, based on everything Naruto had read about him, was a significant duration.
Then he set down the coffee cup.
"Kid," he said to Peter, without looking away from Naruto. "You said ninja from another dimension."
"Yeah."
"And webs."
"From his wrists. Biologically. I watched him do it."
Tony looked at Naruto's wrists. Then back at his face. Then at the screens beside him where FRIDAY's scan data was presumably displaying.
"Okay," he said. He pulled out a stool from under the workbench and sat on it and crossed his arms and looked at Naruto with the focused intelligence of someone who had decided this problem was interesting. "Talk."
Naruto talked.
He told it the same way he had told Peter — complete, direct, in order. His world, his death, the rift, the transit, waking up in Ryu's body. HYDRA's program, the spider genes, what the operative on the rooftop had said about seventy-two hours and the Infinity Residue. What FRIDAY had just said about the secondary signature.
Tony listened without interrupting, which Peter had not managed for more than ninety seconds. The only sign of active processing was the occasional small movement of his eyes toward the screens, checking something, cross-referencing.
When Naruto finished Tony was quiet for a moment.
"Show me the webbing," he said.
Naruto fired a strand at the far wall.
Tony watched it travel, watched it anchor, watched Naruto retract it. Then he looked at Peter.
"FRIDAY, compare the webbing compound from subject two against Parker's."
"Analyzing." A brief pause. "Structurally identical at the molecular level. Production mechanism is biologically equivalent. There are minor variations in the protein folding that suggest the Uzumaki cellular structure has slightly modified the compound since integration — it's approximately twelve percent stronger than Mr. Parker's baseline output."
Peter made a sound.
"Twelve percent," he said.
"Sorry," Naruto said, not entirely sincerely.
"FRIDAY," Tony said, "the secondary signature. What's the closest match in our reference database."
"The closest match is the atmospheric Infinity Residue readings from the post-Blip monitoring program. Structural similarity is approximately sixty-three percent. It's not identical — there are modifications, additional compounds layered over the base Infinity signature. It reads as — Mr. Stark, it reads as engineered. Someone took Infinity Residue and modified it deliberately."
The room was quiet.
Tony looked at his screens. Something in his posture had shifted — a particular quality of stillness that was different from relaxed and different from tense. Focused inward, running calculations.
"The bank this morning," he said. "FRIDAY flagged a HYDRA operation, safety deposit boxes, specific row. I was going to look at it when I'd finished—" He gestured at the workbench. "The boxes that were opened. They were part of a storage program I ran two years ago. After the Blip reversal, there were — concentrations. Areas where the Infinity Residue had pooled in physical material. Objects that had been affected. I had them secured quietly because I didn't want—" He paused. "I didn't want anyone weaponizing them before I understood them."
"HYDRA knew about the storage program," Naruto said.
"Apparently." Tony's jaw was set. "Apparently HYDRA knew about a program I told approximately three people about." He looked at the ceiling in the specific way of someone filing that information for later. "FRIDAY, what was in the boxes that were taken?"
"Three crystalline substrate samples containing high-concentration Infinity Residue. Combined energy yield approximately—" Another pause. "Mr. Stark, combined yield is sufficient to trigger a phase transition in a prepared compound if the compound has a compatible receiver structure."
Tony looked at Naruto.
"The thing inside you," he said. "HYDRA engineered a compound and put it in you. A compound with an Infinity Residue receiver structure."
"That's what it sounds like," Naruto said.
"And they just picked up the material that would trigger it."
"In the next seventy-two hours," Naruto said. "Yes."
Tony stood up from the stool and moved to the main screen bank, pulling data with both hands in rapid gestures, rearranging the display into something only he could currently read.
"What happens when it triggers," Peter said. He was looking at Naruto with an expression that was carefully controlled over something that might have been alarm.
"Unknown," Naruto said.
"You don't feel anything different?"
"I feel it more than I did this morning," Naruto said honestly. "It's like — a frequency. Sitting underneath everything. Getting slightly louder at regular intervals." He paused. "Kurama is monitoring it."
"Kurama," Tony said, not turning around. "The Nine-Tailed Fox. That's inside you too."
"Yes."
"Living in you."
"In my mind. Yes."
"And it's monitoring the foreign compound."
"He," Naruto said. "And yes."
Tony turned around. He had the look of someone who had been building a picture and had just placed a piece that changed the shape of everything around it.
"Can I talk to it — to him," Tony said.
"You can talk to me and I'll relay," Naruto said. "It's not — he doesn't have an external communication channel. He speaks to me internally."
"Okay." Tony leaned against the workbench. "Ask him what the compound is doing. Specifically. If he's been monitoring it."
Naruto closed his eyes briefly.
Kurama. What is it doing.
Integrating, Kurama said. His voice was careful — the careful of someone describing something they were actively observing. It's not passive. It's been building a framework inside the cellular structure since before you woke up. Whatever it is, it was designed to use the Uzumaki healing factor as a construction mechanism — your cells keep repairing and the repair process keeps incorporating the compound rather than eliminating it. It's using our own biology to build itself.
What is it building.
I don't know yet. But it's not random. The structure has intent. Someone designed this very carefully.
And the Infinity Residue material they took from the bank?
If it's compatible — it would be the catalyst. The difference between a structure and an activated structure. A pause. Think of it like a jutsu matrix that's been drawn but not activated. The stolen material is the chakra that completes the hand seals.
Naruto opened his eyes.
He relayed this to Tony with exact precision — Kurama's specific phrasing, the cellular mechanism, the jutsu matrix analogy.
Tony listened without moving.
Then he said: "FRIDAY. Run a full structural analysis on the secondary signature in subject two. I want to know what the framework is building toward. Use everything we have on Infinity Residue behavior, cross-reference with the HYDRA genetic research files from the Project Insight dump, and—" He paused. "And pull the files on what I've been calling the Resonance Problem. The thing I haven't shown anyone yet."
Peter straightened. "The Resonance Problem. Tony, you said that was theoretical—"
"I said I hoped it was theoretical," Tony said. "There's a difference." He looked at Naruto. "I've been tracking an energy anomaly for fourteen months. Coming from outside the galaxy. Far outside — the distance is almost incomprehensible. But it's been moving. Very slowly, but moving. And it responds to Infinity Residue like — like it's attracted to it. Like the Residue is a signal it can follow."
Naruto felt something move in his chest. Not physical. The recognition of a thing he had already half-known.
"I felt it," he said. "This morning. In Sage Mode — Natural Energy perception. Something vast. Patient. At the edge of range."
Tony looked at him.
"Sage Mode extends your perception range," he said. It was not quite a question.
"Significantly."
"What did it feel like."
Naruto thought about how to translate the sensation into language a physicist would find useful.
"Old," he said. "Older than anything I've felt before, and I've been in proximity to things that predate the shinobi world by millennia. Hungry — not like an animal, like a fundamental property. Like gravity is hungry. And—" He paused. "Patient. It's been waiting for something specific. I don't think it's close. But I think the waiting is close to ending."
Tony absorbed this.
He turned back to his screens. "FRIDAY. Upgrade the Resonance Problem to active threat classification. Pull everything."
"Yes, Mr. Stark." A brief pause. "Mr. Stark. Initial analysis of the framework structure in subject two is returning a result you should look at."
"Show me."
A new display appeared — a three-dimensional model, slowly rotating, complex enough that Naruto could not immediately read its meaning. But Tony could. He stood in front of it and went very still.
"Kid," he said.
"Yeah," Peter said.
"You know what a beacon is."
"A signal. Something that broadcasts a location."
"HYDRA built a beacon," Tony said. "Inside him." He turned and looked at Naruto with an expression that had moved through several things and settled on something that was equal parts urgent and deeply unhappy. "When those crystals activate it, it will broadcast a signal. An Infinity Residue signal, which means it will carry across any distance and it will be — it will be unmistakable to anything that's been following Infinity Residue as a trail."
The room was quiet.
Peter broke it first. "They're trying to call it here. The thing outside the galaxy. HYDRA is trying to—"
"HYDRA thinks they can control it," Tony said. The flatness in his voice communicated exactly what he thought of that belief. "Or they think they can use the contact event for leverage. Or they're working for it directly and this is a summoning operation." He pressed both hands against the workbench surface. "All three options are catastrophic."
Naruto stood in the middle of the room and let the information settle.
HYDRA had taken Ryu. Modified his biology over weeks. Built a structure in his cells using his own healing factor as the construction mechanism. The structure was a beacon. When completed with Infinity Residue catalyst, it would broadcast a signal into deep space — a signal detectable by something vast and patient that had been following the trail of Infinity energy toward this planet for over a year.
Seventy-two hours.
He looked at Tony. "Can you remove it."
"I don't know yet." Tony's voice was direct — not soft, not hedged. The honesty of someone who respected the person they were talking to enough to not waste their time. "FRIDAY is still analyzing the structure. If it's as integrated as your — as Kurama describes, removal may not be straightforward. Or possible."
"If you can't remove it?"
"Then we have seventy-two hours to either intercept the crystals before HYDRA uses them, or find a way to counteract the activation, or—" He paused.
"Or what," Naruto said.
Tony looked at him steadily. "Or we make sure that when the signal broadcasts, something answers it that isn't what HYDRA is expecting."
Peter looked between them. "What does that mean."
"It means," Tony said slowly, still looking at Naruto, "that if we can't stop the beacon from activating, we might be able to change what the beacon says." He turned back to his screens. "FRIDAY, I need Bruce on a call. And Fury. And—" He stopped. "And whoever's available. This is not a small morning."
"Already connecting," FRIDAY said.
Peter moved to stand beside Naruto, both of them watching Tony work, the screens filling with data in every direction.
"Hey," Peter said quietly. "You doing okay."
Naruto considered the question with the same honesty he had given it the first time.
There was a HYDRA-built beacon in his body counting down to activation. An ancient incomprehensible entity was moving slowly through the dark toward this planet following a trail of Infinity energy. Seventy-two hours was not a large number.
"Yes," he said.
Peter looked at him sideways. "How."
"Because this is a problem," Naruto said. "And problems have solutions. You find the solution and you move toward it and you don't stop." He paused. "I've been doing that since I was twelve. It doesn't scare me anymore. It just — focuses me."
Peter was quiet for a moment.
"You're kind of insane," he said. But he said it the way you said something to someone you were already beginning to trust.
"Probably," Naruto agreed.
Tony called out from across the room without turning around: "Parker, stop bonding and come look at this. Uzumaki — I'm going to need you to let FRIDAY run a full deep scan. It's going to take about twenty minutes and it might feel strange."
"Define strange," Naruto said.
"Like someone reading a book from the inside of the book."
Naruto thought about the various medical procedures the shinobi world had subjected him to over the years, including one memorable occasion involving Tsunade, a diagnostic jutsu, and language Naruto had not known she knew.
"That's fine," he said.
Tony finally looked at him directly — a full look, the kind that took stock rather than just registered.
"You're not what I expected," Tony said.
"What did you expect?"
"I don't know. Something weirder. Or more — dramatic."
"I've been dramatic," Naruto said. "I grew out of most of it."
Something shifted in Tony's expression. Not quite a smile. More the preliminary state that preceded one.
"Right," he said. "FRIDAY, initiate deep scan on subject two. Full spectrum." He turned back to his screens. "And someone order food. We're going to be here a while."
"I want ramen," Naruto said immediately.
A pause.
"FRIDAY," Tony said.
"Nearest ramen restaurant is four blocks east," FRIDAY said. "Delivery is twenty-five minutes."
"Order it," Tony said. Then, almost to himself: "Of course it's ramen."
The scan began, and the morning became the kind of morning that changed everything after it, and outside the windows New York moved on in its enormous indifferent river, carrying eight million lives forward into a day that none of them knew was already counting down.
End of Chapter 6
Next: Chapter 7 — What FRIDAY Found