The HYDRA compound was dead in the way only places like this ever were — not abandoned, not empty, but preserved.

Concrete corridors stretched long and narrow, lights flickering weakly overhead as snowmelt dripped through ceiling cracks. Every step echoed too loudly.

The Thunderbolts moved in formation.

Yelena led, pistols low. “I hate places like this. They always forget to burn the worst parts.”

“If they forgot it, we clean it up,” John Walker muttered, adjusting his shield.

“HYDRA does not forget,” Alexei rumbled. “They preserve.”

Ghost phased ahead. “Containment suite. Reinforced. No human life signs.”

Bob slowed. “Something’s alive,” he said quietly. “And it’s scared.”

A faint scrape echoed down the hall — claws dragging softly against glass.

Bucky stopped.

“Hold.”

The chamber was circular, steel-braced and clinical. At its center stood a cylindrical glass cell — multilayered reinforced panes bolted into the floor and ceiling with thick steel bands. The glass was aged and slightly frosted from years of cold and breath, distorting whatever stood inside.

There was no door handle.

No external latch.

Only a biometric lock panel mounted several feet away behind another shielded casing.

No one was getting in.

And nothing inside was getting out.

Inside the glass enclosure stood a wolf.

Massive. Charcoal fur dark as smoke, silver feathering along her chest and legs. Built closer to a dire wolf than anything natural. Old scars cut through her coat.

A heavy muzzle encased her snout — leather reinforced with steel framework. It wasn’t symbolic.

It was engineered restraint.

She didn’t lunge at the barrier.

Didn’t pace.

Her amber eyes lifted.

Locked on Bucky.

The glass separated them completely — thick enough that even sound was muted. If she breathed, they couldn’t hear it. If she growled, it wouldn’t reach them.

He couldn’t touch her.

Yelena stepped closer but kept her distance from the perimeter line etched into the floor. “That is not normal.”

“That is soldier,” Alexei corrected quietly.

John studied the enclosure, rapping his knuckles lightly against the outer steel frame — not the glass. “You don’t build a box like that unless you’re afraid it won’t hold.”

Bucky moved forward until he stood inches from the pane.

Cold radiated through it.

Pandora went utterly still on the other side.

Not aggression.

Recognition.

Her nose brushed the interior surface of the glass — leaving the faintest fog where her breath hit.

But there was still space between them.

A barrier neither could cross.

“Buck?” Yelena asked, softer now.

“She was mine,” he said.

Ghost nodded toward a sealed side room. “Control station.”

Inside: dark monitors, containment overrides, and filing cabinets marked with faded HYDRA insignias.

Yelena pulled a folder.

SUBJECT #24590 — PANDORA Species: Enhanced Canine Asset STATUS: ACTIVE / CONTAINED Origin: U.S. Army K9 (Recovered 1945)

Bob turned the page.

PRIMARY HANDLER / FIELD PARTNER: ASSET: WINTER SOLDIER (J. BARNES) Notes: Subject bonded pre-acquisition. Displays extreme loyalty. Elevated stabilization when deployed with Asset WS. Separation results in agitation and containment escalation. Reinforced enclosure required. No direct physical contact permitted outside controlled testing.

John looked back toward the chamber. “You’re telling me that’s your war dog?”

Bucky didn’t answer immediately.

Through the reinforced glass, Pandora hadn’t moved.

Not pacing.

Not snarling.

Just watching him like she had seventy years ago.

“They took her after the train,” he said quietly. “She tried to pull me up.”

Silence settled heavy in the control room.

“They didn’t pair us,” he added, eyes fixed through layers of steel and frost. “We were already a team.”