The Doctor, Lilith, Donna, and Martha were all hanging onto the console to keep from being thrown across the room by the TARDIS’ crazy flying.
“What the hell's it doing?” Donna yelled.
“The control's not working!” the Doctor shouted. He got thrown to the floor and nearly face planted. “I don't know where we're going, but my old hand's very excited about it.”
Donna stared at him. “I thought that was just some freaky alien thing. You telling me it's yours?”
“It got chopped off,” Lilith explained. “He grew a new one.”
“You are completely impossible.”
“Not impossible. Just a bit unlikely.”
There was a bang, and sparks, then stillness. The Doctor and Lilith sprinted outside. They were in a tunnel that looked like a junkyard in a railway arch at night.
“Why would the TARDIS bring us here, then?” the Doctor wondered.
“Oh, I love this bit,” Martha said.
“I thought you wanted to go home,” Donna teased.
“I know, but all the same, it's that feeling you get.”
“Like you swallowed a hamster?”
A group of soldiers appeared. “Don't move! Stay where you are! Drop your weapons!” Three men are pointing rifles at them; Lilith went for her blaster.
“Lilith, no,” the Doctor said firmly. She stuck her tongue out at him and the four of them raised their hands in surrender. “We're unarmed. Look, no weapons. Never any weapons. We're safe.”
“She’s got a gun.” One of the soldiers jerked his rifle at Lilith.
“Well, she’s harmless.”
“Look at their hands,” another said. “They're clean.”
The leader motioned to the Doctor. “All right, process them. Him first.”
The two other soldiers grabbed the Doctor’s arms. “Oi. Oi!” he protested. “What's wrong with clean hands?”
“What's going on?” Martha asked.
The Doctor was taken to a machine and his right arm was shoved inside it. “Something tells me this isn't about to check my blood pressure. Argh!” Clearly, it hurt. Lilith wanted to shoot the machine, repeatedly, but something held her back.
“What are you doing to him?” Donna demanded.
“Everyone gets processed.” The leader’s voice was stiff.
“It's taken a tissue sample,” the Doctor said. “Ow, ow, ow, ow, ow, ow, ow, ow. And extrapolated it. Some kind of accelerator?” He was released and stumbled back over to the girls.
“Are you all right?” Martha looked at his hand. There was a graze on the back of it.
“What on earth?” the Doctor breathed. “That's just—”
A pair of glass and metal doors opened and a painfully familiar figure stepped out from the steam of the brightly lit interior. A skinny blonde woman in combat boots, black pants, and an army green t-shirt. Lilith’s blood turned to ice as she was struck with a memory of a hug goodbye.
Don’t forget me.
I’ll see you when you’re born, then.
“Arm yourself.” The leader handed her a rifle.
“Where did she come from?” asked Martha.
“From me,” the Doctor replied, still shocked.
“From you? How? Who is she?”
“Well, she's, well, she's my daughter.”
Jenny beamed at them. “Hello, Dad.” She took her place with the leader and the other soldiers at a barricade.
Donna stared. “Did you say daughter?”
“Mm. Technically,” the Doctor confirmed.
“Technically how?” Martha prodded.
“Progenation. Reproduction from a single organism,” he explained. “Means one parent is biological mother and father. You take a sample of diploid cells, split them into haploids, then recombine them in a different arrangement and grow. Very quickly, apparently.”
“Something's coming,” Jenny announced.
Lilith drew her blaster. The Doctor grabbed her arm. “What the hell do you think you’re doing?”
She pulled her arm away. “Helping.” Lilith stood next to Jenny and aimed the weapon down the tunnel.
“What kind of gun is that?” Jenny asked.
“51st century blaster. Got it from our Uncle Jack.” Lilith winked at her.
Shadows appeared on the tunnel wall. As they came into view, the figures started firing. “It's the Hath!” the leader shouted. The soldier’s returned fire.
“Get down!” Jenny yelled to the three behind them.
The Doctor, Martha, and Donna took cover. The Hath were wearing breathing masks, but they had squinty fish eyes and very wrinkled necks.
“We have to blow the tunnel. Get the detonator,” the leader ordered.
“I'm not detonating anything!” The Doctor went to help a wounded soldier. The Hath breached the barricade and one grabbed Martha.
Jenny took on another hand to hand, knocking it down, and Lilith shot it. Jenny dove for the detonator.
“Martha!” the Doctor shouted.
Lilith saw Jenny preparing to activate the detonator. “Jen! Don't!”
She hit the button. A klaxon sounded and everyone ran before the big explosion brought down the roof.
“You've sealed off the tunnel. Why did you do that?” the Doctor demanded.
“They were trying to kill us,” Jenny protested.
“But they've got my friend!”
“Collateral damage. At least you've still got them.” She nodded at Lilith and Donna. “He lost both his men. I'd say you came out ahead.”
“Her name's Martha,” Donna snapped. “And she's not collateral damage, not for anyone. Have you got that, GI Jane?”
Lilith bristled. “Chill, Donna. I’m sure Martha’s fine.”
“I'm going to find her,” the Doctor said.
“You're going nowhere. You don't make sense, you two. No guns, no marks, no fight in you. Only she works.” The leader pointed at Lilith. “I'm taking you three to General Cobb. Now, move.”
“I'm Donna,” Donna introduced as they were led deeper into the tunnel. “What's your name?”
Jenny shrugged. “Don't know. It's not been assigned.”
Donna frowned. “Well, if you don't know that, what do you know?”
“How to fight,” the blond answered, bluntly.
“The machine must embed military history and tactics, but no name.” The Doctor’s tone was disgusted. “She's a generated anomaly.”
“Generated anomaly,” Donna mused. “Generated. Well, what about that? Jenny.”
Jenny smiled. “Jenny. Yeah, I like that. Jenny.”
There. Now Lilith could actually use her name. “What do you think, Dad?”
He didn’t look back. “Good as anything, I suppose.”
Donna raised an eyebrow. “Not what you'd call a natural parent, are you?”
“They stole a tissue sample at gunpoint and processed it. It's not what I call natural parenting.”
“Rubbish,” she dismissed. “My friend Nerys fathered twins with a turkey baster. Don't bother her.”
“You can't extrapolate a relationship from a biological accident.”
“Child Support Agency can,” Donna argued.
Jenny turned to Lilith. “When I asked about your gun, you said our Uncle Jack gave it to you. Who are you?”
“I’m his daughter, too.” Lilith gestured to the Doctor. “That makes you my sister.”
They reached a large room with a slightly domed roof and a gallery. There were more progenation chambers there. “So, where are we? What planet's this?” the Doctor asked.
“Messaline,” the leader said. “Well, what's left of it.”
“Six six three seventy five deceased. Generation six six seven one, extinct. Generation six six seven two, forty six deceased. Generation six six eight zero, fourteen deceased.”
“Damn, that’s a lot of death,” Lilith muttered.
“It's like a town or a city underground. But why?” Donna wondered.
A man with a neatly trimmed white beard approached. The Doctor stuck his hands in his pockets. “General Cobb, I presume.”
“Found in the western tunnels, I'm told, with no marks. There was an outbreak of pacifism in the eastern zone three generations back, before we lost contact. Is that where you came from?”
Lilith cocked an eyebrow. "You make pacifism sound like a disease."
“Eastern zone, that's us, yeah. Yeah. I'm The Doctor. This is Donna and Lilith.”
“And I'm Jenny,” Jenny added.
“Don't think you can infect us with your peacemaking. We're committed to the fight, to the very end.”
“Well, that's all right. We can't stay, anyway.” The Doctor shrugged. “We've got to go and find our friend.”
Cobb straightened up. “That's not possible. All movement is regulated. We're at war.”
“Yeah, we noticed,” Lilith snorted. “With those Hath.”
The Doctor frowned at her. "But tell me, because we got a bit out of circulation, eastern zone and all that. So who exactly are the Hath?”
The General clasped his hand behind his back and led them around. “Back at the dawn of this planet, these ancient halls were carved from the earth. Our ancestors dreamt of a new beginning. A colony where human and Hath would work and live together. “
“So what happened?” the Doctor asked.
“The dream died. Broken, along with Hath promises. They wanted it all for themselves. But those early pioneers, they fought back. They used the machines to produce soldiers instead of colonists, and began this battle for survival.”
“There's nothing but earth outside, why's that? Why build everything underground?” questioned Donna.
“The surface is too dangerous,” the leader from earlier told her.
“And what does this mean?” She pointed to a plaque that had a bunch of numbers.
“The rites and symbols of our ancestors. The meaning's lost in time.”
Lilith looked from the plaque to the General. “How long's this war gone on for?”
“Longer than anyone can remember,” he answered. “Countless generations marked only by the dead.”
“Fighting all this time when the only outcome is more death? Why?"
“Because we must,” Jenny said. “Every child of the machine is born with this knowledge. It's our inheritance. It's all we know. How to fight and how to die.”
Lilith took Jenny’s hand. “But that’s not all you need to know.”
Cobb took them to a holographic map. The Doctor studied it. “Does this show the entire city, including the Hath zones?”
“Well, it'll help us find Martha.”
“We've more important things to do. The progenation machines are powered down for the night shift, but soon as they're active, we could breed a whole platoon from you three.”
Lilith sneered at him. “You go anywhere near my DNA, I’ll blow your head off.”
“I'm not having sons and daughters by some great big flipping machine,” Donna snapped. “Sorry, no offence, but you're not. Well, I mean, you're not real.”
“Donna!” Lilith scolded.
“You're no better than him. I have a body, I have a mind, I have independent thought. How am I not real? What makes you better than me?” Jenny demanded. Lilith put her hand on her shoulder.
“Well said, soldier,” Cobb said. “We need more like you, if ever we're to find the Source.”
That interested the Doctor. “Ooh, the Source. What's that, then? What's a Source? I like a Source. What is it?”
“The Breath of Life.”
“Great. Clarification, please?” Lilith requested.
“In the beginning, the great one breathed life into the universe. And then she looked at what she'd done, and she sighed.”
“She.” Jenny smiled. “I like that.”
Lilith nudged her, playfully. “Girl power, huh?”
“Right. So it's a creation myth,” the Doctor said.
“It's not myth,” Cobb insisted. “It's real. That sigh. From the beginning of time it was caught and kept as the Source. It was lost when the war started. But it's here, somewhere. Whoever holds the Source controls the destiny of the planet.”
“Ah ha!” the Doctor exclaimed. “I thought so. There's a suppressed layer of information in this map. If I can just…” He used the sonic screwdriver on the map and more tunnels and chambers appeared. “A whole complex of tunnels hidden from sight.”
Cobb’s eyes widened. “That must be the lost temple. The Source will be inside. You've shown us the way. And look, we're closer than the Hath. It's ours.” He turned to a nearby soldier. “Tell them to prepare to move out. We'll progenate new soldiers on the morning shift, then we march. Once we reach the temple, peace will be restored at long last.”
“S’cuse me,” Lilith said. “Yeah, hi. If you really want peace, why don’t you just, oh, I don’t know, stop fighting?”
“Only when we have the Source. It'll give us the power to erase every stinking Hath from the face of this planet.”
“Hang on, hang on.” The Doctor stopped Cobb. “A second ago it was peace in our time. Now you're talking about genocide.”
“For us, that means the same thing,” the General said.
Lilith spluttered. “That same thing?"
“Then you need to get yourself a better dictionary. When you do, look up genocide. You'll see a little picture of me there, and the caption will read, over my dead body,” the Doctor growled.
“And you're the one who showed us the path to victory. But you can consider the irony from your prison cell. Cline, at arms,” Cobb ordered.
Cline pointed his gun at Donna. “Oi, oi, oi. All right. Cool the beans, Rambo.”
“Take them. I won't have them spreading treason. And if you try anything, Doctor, I'll see that your woman dies first.”
Lilith couldn’t hold back a snicker.
“I am not his woman,” Donna protested at the same time the Doctor said, “No, we're, we're not a couple.”
“Come on. This way.” Cline gestured with his gun
“I'm going to stop you, Cobb,” the Doctor warned. “You need to know that.”
Cobb scoffed. “I have an army and the Breath of God on my side, Doctor. What'll you have?”
“This.” He tapped his temple.
“Lock them up and guard them.”
“What about the new soldier?” Cline asked.
Cobb looked at Jenny. “Can't trust her. She's from pacifist stock. Take them all.”
Lilith glared at him. “Come on, Jen.”
“More numbers,” Donna noted as the four of them were shoved into a cell. “They've got to mean something.”
“Makes as much sense as the Breath of Life story,” the Doctor muttered.
“You mean that's not true?” Jenny asked.
“No,” Lilith said, “it's a myth. Isn't it, Dad?”
“Yes, but there could still be something real in that temple. Something that's become a myth. A piece of technology, a weapon.”
Donna frowned. “So the Source could be a weapon and we've just given directions to Captain Nutjob?”
Lilith groaned. “Well that’s just great. I’m not in a place to call anyone ‘trigger-happy’, but if anymore is worse than me, it’s him.”
“That's why we need to get out of here, find Martha and stop Cobb from slaughtering the Hath.” The Doctor looked up at Jenny. “What, what are you, what are you staring at?”
“You keep insisting you're not a soldier,” she said, “but look at you, drawing up strategies like a proper general.”
“No, no. I'm trying to stop the fighting.”
“Isn't every soldier?”
“Well, I suppose, but that's… that's…. technically…” He struggled for words. “I haven't got time for this. Lilith, I need your phone.”
“Left it on the TARDIS.”
The Doctor huffed. “Fine. Donna, give me yours. Time for an upgrade.” He pulled out the sonic.
“And now you've got a weapon,” Jenny added.
“It's not a weapon.”
“But you're using it to fight back,” she argued. “I'm going to learn so much from you. You are such a soldier.”
Lilith gently pulled Jenny to the side. “It may not be such a great idea to be talking like that while he’s still getting used to you.”
“Why not?” Jenny asked. “No one can deny what they are.”
“No, but they can try. And that’s what he’s been doing for years.” Lilith sighed. “Dad had a family before us and they were all killed in a war that he fought in. He’s trying to forget.”
The Doctor snapped Donna’s phone shut. “They're getting ready to move out. We have to get past that guard.”
“I can deal with him,” Jenny offered.
The Doctor caught her arm. “No, no, no, no. You're not going anywhere.”
“You belong here with them.”
“She belongs with us,” Lilith insisted. “She's your daughter, my sister.”
“How can you just accept her like that?” he snapped.
“How can you not?” she countered.
“She's a soldier. She came out of that machine.”
“It doesn’t matter if you’re natural born, loomed, or stepped out of a damn progenation chamber fully grown. Family is family, Dad, and we don’t have a lot left.” Lilith reached into the Doctor’s transdimensional pockets and pulled out his stethoscope. She put one end against Jenny’s chest.
Jenny flinched. “What are you doing?”
“It's all right. Just hold still, Jen.” She listened to Jenny’s chest and smirked. “Here, listen. Then you can tell me where she belongs.”
The Doctor listened. “Two hearts,” he breathed.
Donna looked at her. “Does that mean she's a, what do you call a female Time Lord?”
“Technically, she’s a Gallifreyan,” Lilith clarified.
“What's a Gallifreyan?” Jenny asked.
“It's who I am,” the Doctor answered. “It's where I'm from.”
“And I'm from you.”
The Doctor glared at her. “You're an echo, that's all. A Time Lord is so much more. A sum of knowledge, a code, a shared history, a shared suffering. Only it's gone now, all of it. Gone forever.”
“There was a war.”
“Like this one?”
The Doctor scoffed. “Bigger. Much bigger.”
“And you fought, and killed?”
“Yes,” he admitted.
Jenny stared him down. “Then how are we different?”
“Neither of you had a choice,” Lilith said, firmly. “Dad, you fought because there was no other way. Jenny fought because that’s all she knows. But now there is a choice. She doesn’t have to be a soldier, we can teach her more. But she needs you to learn.”
Jenny straightened up. “Well, then. First step is getting out of here.” She walked over to the bars where the Cline stood. “Hey.”
“I'm not supposed to talk to you. I'm on duty,” he said.
“I know. Guarding me. So, does that mean I'm dangerous, or that I need protecting?”
Cline chuckled. “Protecting from what?”
“Oh, I don't know. Men like you?” Jenny grabbed him and kissed him. While he was distracted, she snatched his pistol. “Keep quiet and open the door.”
“Now, could any of us have pulled that off?” Lilith asked, smugly.
They ran down the halls. A guard was waiting on the lower flight of metal stairs. Lilith swore in Gallifreyan. “That's the way out.”
Jenny raised the pistol.
“Don't you dare,” the Doctor warned.
“Let me distract this one. I have picked up a few womanly wiles over the years.” Donna flipped her hair over her shoulder.
The Doctor put his arm out to stop her. “Let's save your wiles for later. In case of emergency.” He rummaged in his coat pockets, and a few moments later a clockwork mouse ground to a halt behind the guard. He picked it up and Jenny karate chopped him from behind. “I was going to distract him, not clobber him,” the Doctor hissed.
“Well, it worked, didn't it?” Jenny defended.
The Doctor took the mouse back from the unconscious guard. “They must all have a copy of that new map. Just stay there. Don't hurt anyone.”
Jenny looked at Lilith. “Is he always like this?”
Lilith sighed. “Violence is for when nothing else works and when he’s trying to get himself killed.”
“Does that happen a lot?”
“Option one? Not really. Option two? Oh, yeah.”