Owen was busy in the medical bay when the Doctor arrived. Fenn was hooked up to an innumerable amount of wires and tubes, and Owen was looking downright flustered. The Doctor stepped forward, "How is she doing?"
Owen looked up at him, "Very well, considering the circumstances. By that I mean she's not dead yet."
Jack joined the conversation, "Is it the Huon energy?"
Owen nodded, looking worried. There was silence for a minute or two while Owen worked. The Doctor was desperately trying to think of something he could do. He started muttering under his breath... "Huon energy, huon energy, how to stabilise it? C'mon, think, think..." Suddenly he jumped up, "Oh, that's it!"
Jack and Owen looked up in surprise, "What?"
The Doctor was clearly in his element after a breakthrough, "Huon energy! The TARDIS contains huon energy!" He ran out of the room full-pelt, heading towards the TARDIS. Jack and Owen could only sit and watch while the Doctor put his plan into action. The TARDIS materialised in the medical bay and the Doctor burst out of the doors, carrying two cables. He brought them up to Owen and handed them to him, "Do you have a defibrillator?"
Owen nodded wordlessly.
"Good, then wire these up to it." He ran back into the TARDIS and Jack followed him and asked, "Doctor, what are you doing?"
The Doctor was running around the console, flicking switches and buzzing wires with his sonic. He looked up at Jack, "The TARDIS contains pockets of huon energy, but also artron energy. If I release a controlled amount of artron energy down one of those cables, it will have a reverse effect and literally absorb the huon energy residue and carry up the other cable back into the TARDIS. The two energies are almost exact opposites."
Jack just nodded, "Okay. So, are you sure this will work?"
Jack walked out, leaving the Doctor to do his thing. Owen looked up, "What's he doing?"
Jack shrugged, "Absorbing the energy into the TARDIS. Do you need an extra hand?"
Owen shook his head, "No, I've got it."
"Okay," Jack was about to sit down on one of the few chairs in the bay when Ianto arrived with coffee. He picked up a mug, "Thanks, Ianto."
Ianto smiled, "No problem. Owen, you want one?"
Owen looked up, surrounded by wires and medical equipment, "I'll be fine, thanks Ianto."
"Okay; Doctor- you want a coffee?"
The Doctor ran out of the TARDIS and started wiring up the defibrillator with his sonic, taking the screwdriver off Owen. Ianto tried again, "Doctor?"
He looked up, "What?"
"Do you want a coffee?"
The Doctor looked at him, hard, "My friend is on her death bed and you're asking me for coffee?!"
Ianto mumbled, "I'm sorry, I just thought..."
"Yeah, well I'm a bit busy for coffee at the moment."
Jack spoke up, "Oh, come on Doctor, he's just trying to help. Be nice."
The Doctor didn't answer. Owen stepped out of the wires and took a mug from Ianto. They stood watching the Doctor work for a few minutes before Jack spoke up, "So, Doctor, out with it."
The Doctor turned to look at him, "What do you mean?"
Gwen spoke up, "Who is she?"
He turned back to the wires, "Her name's Fenn; she's a time agent. I believe you've met."
A strange look flashed across Jack's face, "How did she end up shot? And why is she with you?"
"Delven got her. It's a long story. I'll explain later," he twiddled a few things and jumped up, "Aha! Finished! You, Owen, come over here and hold this paddle." He was holding out one of the defibrillator paddles that were now hooked up to the TARDIS. Owen hurried over and took the paddle, and they stood either side of Fenn. Owen had to ask, "What is this going to do?"
The Doctor looked at him, "Absorb the huon energy and enhance her immune system. It's just artron energy, nothing to worry about. The TARDIS will absorb the huon energy into its mainframe and use it as fuel."
Owen nodded, "So do we still use it like a defibrillator?"
The Doctor laughed, "Yes. Are you ready?"
Owen nodded and they waited in silence for a moment until it was shattered like sugar glass when the Doctor said, "Clear!"