This story begins two weeks after the episode Night (Voyager s5e1) and just before the end of Death Knell (Stargate SG-1 s7e16).
No particular knowledge of Stargate SG-1 is needed to follow this story.

Prologue

His knuckles white from grasping the pommel of his cane too tightly, Jacob Carter knocked on the open door of General Hammond's office, taking some weight off his injured leg. "Any news on Sam?" he asked.

George Hammond lifted his eyes from yet another report on the disaster that had befallen the Alpha site. Carter was a soldier, like his daughter. He was not after platitudes. "Not yet, but we have an unmanned aerial vehicle airborne and all available Stargate teams are searching. I don't know anyone tougher or more resourceful. She'll find a way out of this."

He couldn't imagine his top team, SG-1, without Major Samantha Carter.

###

"Ensign, what's the status on those readings?"

"There's evidence of dilithium on the surface, Captain, but I can't get a proper lock on the source."

"We can't afford to be choosy. Give me the latest coordinates you've got. I'll land the shuttle as close as possible."

"Captain, the sensors indicate a solar flare on an intersection course."

"Compensate, factor two zero—"

"Unable to compensate. Gravimetric distortion straight ahead! We're—"

"Brace yourselves!"

###

The view on the bridge screen regained its coherence, and Chakotay shook the remains of a splitting headache away.

"Analysis, Ensign Kim."

"The sensors picked up a chroniton wave emanating from the third planet of the system, Commander. It was already destabilising by the time it reached the ship. The internal computer clock confirms the ship was not affected by any temporal shift."

"Continue to monitor, Ensign. Tuvok, check with the away teams."

~Engineering to bridge~

"Go ahead, B'Elanna."

~We are having problems with the warp engine field, Chakotay. It's unstable.~

"Do what you can but don't shut it down. I don't want us to be stuck here if the phenomenon repeats itself."

~Understood, Torres out.~

"Commander, the away teams surveying the neighbouring systems have reported back. No damage sustained. However, the shuttle bound for the third planet is not responding to my hails."

Chakotay leaned forward. "Who was on board?"

"Crewman Jonys, Ensigns Anderson and Dorado," Tuvok answered, "and the Captain."

Chakotay's hands tightened on the arms of his command chair. "Any distress calls?"

"None, Commander."

"Harry, scan for the shuttle warp signature. Tuvok, recall the other away teams."

"Long range sensors are detecting no trace of the shuttle," Harry Kim said in a despondent voice. "It's like it just vanished."

"Tom, bring us in orbit over the third planet. Impulse only. Harry, scan for human life signs. The crew might have transported directly to the surface."

After two months spent in the void and unable to resupply, Voyager needed all the raw dilithium they could find, but not at the cost of losing three crew members and the ship's captain.

Chakotay fell back in his seat.

I did not risk a court-martial to stop your suicidal plan to save the ship a mere two weeks ago for you to die on me during a routine survey mission.

Where are you, Kathryn?

Where are you?

This story would never had seen the light without the support of ariella884. She made sure my SG-1 characterisation was as good as it could be. Devovere was my guinea pig as she has not seen SG-1. She was there for all the bits that can go wrong in a story. Anything that escaped those talented and very patient betas is entirely my responsibility.

My thanks to The-Goofball. His marvellous Voyager-SG1 crossover gifs on Tumblr gave me the idea that maybe, just maybe, a crossover would be fun to imagine. Writing it was another matter altogether, but that is hardly his fault.