"It's nanotechnology," Rodney announced, studying the magnified image on the computer screen. He, along with Weir, Sheppard and Ruiz, had been called to the lab in light of Dunne's discovery. Carmen had spared a disapproving glare at her nurse, and Rick knew there would be a reckoning for his disobedience. For now, though, everyone was focused on the anomaly in Carson and Klia's bloodwork.

Elizabeth leaned in and squinted at the microscopic object on the screen. "Can you tell what its purpose is?"

"I have no idea," Rodney muttered, but his fingers were already flying across the keyboard. "It's not giving off energy or radiation. It doesn't react to any stimuli I can think of, and it totally ignores the Ancient gene. Where the hell is Radek? He isn't answering his radio."

"Rodney?" Sheppard drawled with a hint of alarm. The others followed his gaze to the computer screen. The nanite, previously floating dormant in the sample, had begun to move, spinning rapidly.

McKay studied the readouts. "What the…now it's giving off energy."

"I hope I'm not intruding." Teyla said from the doorway. "I wondered if there was any news."

"Teyla, go back out in the hallway," McKay ordered. The Athosian raised an eyebrow, but did as she was bidden. "Keep going," Rodney called. "Farther, farther – stop!"

The nanite was still.

"May I reenter?" Teyla called.

"Yes, yes, come back in."

By the time she passed the threshold, the nanite was rotating again.

"Oh my," Rodney said. "That is interesting."

"It responds to Teyla's presence," Weir frowned. "Does that mean what I think it means?"

"It means we're probably dealing with Wraith technology." Sheppard glanced at Rodney for confirmation.

"He's right." Rodney put a hand to his chin and put his brain to work. "Klia somehow gets this nanite from the Wraith, then arranges to pass it on to Carson during a checkup. A little bump or twitch at the right moment, and he's a stuck pig."

Carmen shook her head. "You're saying these nanites were able to control Carson's actions?"

"Of course not, they're tiny little machines, they don't have any psychic abilities." McKay's face lit up. "But the Wraith do. Under the right circumstances, they were able to influence Teyla. The nanites must allow them to do the same to Carson, only they need help. They need Teyla to act as some sort of catalyst, an amplifier, if you will."

"Why would the Wraith target Carson?" Ruiz asked.

"That's not important right now," Rodney dismissed. "We need to find a way to disable or eradicate these things."

Teyla was pale. "My presence is harming Doctor Beckett. I should leave for the mainland immediately."

"I don't think that's necessary," Ruiz said. "Carson is safe, there's no way he can hurt himself."

Sheppard tapped his earpiece. "Lorne, have a security team meet me at…where is Klia liable to be?"

"Chez Zelenka, most likely," Rodney said.

"Have a team meet me at Zelenka's quarters."

Weir put a hand on Sheppard's arm. "John, we don't know that Klia has any blame here. She may not know about the nanites. She could be as much a victim as Carson is."

"I'll tread gently," the colonel promised.

"And tell Radek to get his ass out of bed, I need him here," McKay called as Sheppard left the lab.