First installment. Will continue at reader request. (Really, I will this time…)

This is a Dr Who x Stargate SG-1 Crossover story. It features the 4th Doctor. (Tom Baker).

Chapter One

"Well, I always like a visit home…" he looked around, "…and it's always an honor to stand before such…and esteemed…council…as I see before me…" he trailed off, frowning. "Oh for heaven's sake, is this all the welcome I get? I've received a warmer welcome on Skaro!" He leaned close to the nearest Time Lord. "Would it strain your face to smile?"

The Time Lord stared back at him, apparently appalled by the suggestion.

"Doctor," the head councilor addressed him, "if you are quite finished – "

"Finished?" The Doctor snorted, "I've barely begun! You lot have stagnated yourselves in ceremony and procedure! I sometimes think Gallifrey is the most sterile, inert planet in this galaxy." With a reproachful look at the head councilor, he strode back to his place before the council. "Well?" He asked sullenly. "Are you going to tell me why I'm here?" He broke into a toothy grin, and adjusted his hat. "The suspense is killing me."

The head councilor cleared her throat. "Doctor, as you well know, it is against Gallifreyan law to interfere with the time stream, particularly when it will affect the development of other races, but – "

"But it's not against the law if you send one who chooses to ignore it?" The Doctor leaned close. "Was that what you were going to say?"

"Words to that effect, yes." The head councilor said sulkily.

"Typical hypocrisy!" The Doctor snapped. "You won't break your own stifling laws, you'll just get someone else to do it for you!"

"You chose to leave Gallifrey," the head councilor reminded him, "in a stolen TARDIS, I might add. We have given you significant freedoms – "

"Oh, spare me that drivel," the Doctor scowled, "we've been through it before, and far too many times for my liking." His gaze swept across the council. "I'm still waiting…"

"Doctor," the head councilor began, "are you familiar with the race known as the Borg?"

"The Borg?" The Doctor threw back his head thinking, then he smiled, "Yes, the Borg! Cybernetic species, reproduces by forced assimilation, almost as skilled in conversation as Time Lords." He ignored the councilor's frowns of disapproval, and grew suddenly serious. "A species devoid of compassion. Driven only by the need to advance; biologically, technologically, spatially, temporally…what about them?"

"Are you aware also, Doctor, of the Goa'uld System Lords?"

"Well of course I am!" The Doctor snapped back, personally affronted. "Any traveler knows not to trespass through their space, well, unless you're tactful and resourceful. Strength in arms means little against such – "

"The two may soon come into contact, to the benefit of the Borg, and the destruction of scores of systems in that region of space."

"Well," the Doctor shrugged. "That's not our problem is it? One nasty species gets over taken by another, that's how the universe works. If we were to step in every time a species like the Borg or the Cybermen assimilated a culture, we'd – "

"Perhaps you have forgotten, Doctor, that the planet Earth, a planet to which you were once exiled, owing to your fondness of it, lies in that very region?"

"Earth…" he Doctor whispered. His eyes narrowed. "So that's why you're counting on me helping you…"

"The Earth will be assimilated – "

"Wait!" The Doctor gestured for silence, his brow creased in thought, "what time period are we talking about? What level of technology will humanity possess?"

"They will be at war, covertly, with the Goa'uld. They posses one starship, of Asgard design. It will not avail them. The assimilation of the Goa'uld will alert the Borg to the presence of the Asgard as well, and both their powerful technological capabilities will augment the Borg's already formidable – "

"I'll do it!" The Doctor said suddenly. "Give me the space-time coordinates and I'll do what I can."

"There is one precaution, Doctor…" the head councilor said ominously.

"Oh, what's that?" The Doctor asked.

"The assimilation of a Time Lord or a TARDIS into the Borg Collective would have incalculable and catastrophic repercussions for the galaxy, and indeed our universe. We shall be monitoring you progress. Should we deem that your TARDIS is at a risk of being assimilated by the Borg, we will recall it to us."

"And what if I'm not inside it?" The Doctor leered.

"A time ring will be provided, as per your mission on Skaro. A mission you failed." The head councilor leaned forward sternly. "Do not fail this time, or your humans will pay the price."

"They've already paid the price," the Doctor muttered, "at the proverbial hands of the Daleks."

"The time ring is to be used only if you are separated from your TARDIS and find yourself at the mercy of the Borg."

"But not from the Goa'uld…I see…"

"The space-time coordinates have been entered into your TARDIS's console. Would you like someone to assist you in your endeavor?"

"No thank you," the Doctor smiled his toothy grin. "I work best on my own. And besides," he popped a jelly baby into his mouth, "I prefer human as company. They use their brains for survival. No point listening to logic and theory in the middle of something as illogical and practical as a warzone."

"We wish you the best of luck, Doctor."

"Thank you," the Doctor grinned, "I wish you the same."

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Closing the TARDIS doors, the Doctor slumped over the control console. "Why is it always me? Always me that has to do this?" Muttering and scowling, he began the dematerialization process. The time rotor rose and fell with a wheezing groan. The Doctor eyed it dubiously. "That sounds a bit off. I hope you're up to the task, Old Girl…" at that moment, the rotor stopped. The Doctor stared at it, open mouthed and wide eyed. It started again, just as he was about to run a diagnostic. Uneasily, he looked around the console room. "Don't push me! All I ask is a smooth transit, a clear materialization, and no less than a five minute's walk from our destination!" He would have walked off, but thought of something else. "And the correct time and place wouldn't be amiss either!" He walked off, to the kitchen. "Temperamental thing."

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"How old do you think she is?" Carter muttered.

"She looks like a high school student." Daniel remarked.

"Are you two quite finished?" O'Neil hissed.

They regarded him with confusion. Daniel adjusted his glasses. "You seem unusually tense."

"Yeah, why shouldn't I be?"

"It's not the first time a goa'uld has caught us, and I doubt it will be the last."

"It might be," O'Neil muttered, staring at the door with a gaze that could have shattered glass. "She's a strict one. Did you see the way she treats her jaffa?"

"It is not unusual O'Neil," Teal'c spoke suddenly. "Cronos was himself as vindictive."

"So…do you know her, that schoolgirl?"

Tealc looked away. "I do not. The crest in her throne room indicates she serves the goa'uld Amaterase."

"Amaterase," Daniel perked up, "the Japanese goddess of light and the sun."

"She likes 'em young then…" O'Neil strode across the room and thumped the wall in an ill humor.

Teal'c reproached him. "Recall, O'neil, that the true age of our enemy is the age of the goa'uld inside her. It would be at least several hundred years old to have attained such a rank."

"That doesn't change the fact that we were outwitted by a schoolgirl!" O'Neil leered.

The door opened. The four turned, astonished at the speed of the visit. They were usually left to wait longer.

Their captor stepped in, alone, and shut the door behind her.

The team regarded her with surprise. No jaffa body guard? She wasn't even wearing a ribbon-device weapon.

O'Neil stepped forward. "Well, hello there," he smiled sarcastically. "To what do we owe the pleasure of this…personal visit?"

"There is no pleasure to be had in your situation!" The girl snapped back. "I had heard the warriors of the Tau'ri were cunning and resourceful. I pray you are not representative of their finest."

The three humans exchanged puzzled looks. Even Teal'c turned to face her, his eyebrow cocked.

"What?" Was all O'Neil could manage.

"Why are you here?" The girl demanded.

"Who are you?" Teal'c stood up. She stared at him, astonished.

"I had not noticed…a jaffa?" She took note of the emblem upon his head. "Apophis sect. And of high rank. I might ask who you are too, and why you are in the company of Tau'ri warriors.

"I am Teal'c," Teal'c said. "I was First Prime of Apophis, until I found better company with the Tau'ri." He regarded her thoughtfully. "You have not heard of me?"

The girl blinked.

"I did not think there was a goa'uld who had not heard my name. It is cursed by every system lord."

"I have not heard of you," the girl said. "Nor of anything as outrageous as your alliance with the Tau'ri. But I know that whoever you are, you have chosen an inopportune time and place to visit this planet. My mistress, the great goddess, Amaterase, shall soon descend. Something here has caught her attention. I have come to oversee the work. I did not expect to find saboteurs. I did not think that…mere Tau'ri…or renegade Jaffa would dare to raise their hand against my queen."

"We're not saboteurs!" O'Neil said wearily. "We were doing a survey…"

The girl eyed him with mistrust. "Do the surveyors from your planet carry such weapons as you had in your possession, crude as they are?"

"Well," O'Neil shrugged, "we did have a feeling you guys…or girls…might be dropping by…" he grinned. "Better safe than sorry."

"You will be sorry." The girl frowned. "You are my prisoners…and I am to make an example of any and all who trespass or bear arms against my queen. I must…kill you."

"Gee…you seem upset about it." O'Neil put his hands on his hips.

"I have no desire to kill those who are no real threat."

The team exchanged glances again, this time, mildly offended. O'Neil did a double take. "You don't think we pose a threat?"

"Do you?" The girl suddenly looked serious. "You said you were here on a survey mission."

"Yeah…that's right," Daniel said, interrupting. "We would like to leave, if you'd let us. We pose no threat. You may keep and destroy our weapons. If you'd just let us leave via the stargate – "

"Are you Tok'ra?" Teal'c asked suddenly. He was staring at the girl with the keenest interest.

"I am not!" She snarled, and her eyes flashed. Then she stepped away, eyeing them all with uncertainty.

O'Neil leaned over to Carter and whispered. "Is she…afraid?"

"Yeah…seems so…" Carter frowned.

"I didn't think goa'ulds got scared, you know, the whole 'god complex'…"

Teal'c approached her, slowly. "You are not like any goa'uld I have encountered…yet you are not Tok'ra. Who are you?"

"I am…Tsukuyomi…"

"The god of the moon…" Daniel murmured.

"The god?" O'neil repeated sarcastically. "This girl?"

"My host is young." Tsukuyomi agreed. "I had little care for the one my queen bestowed upon me. He was too…brutish."

"What, so she just let you change it, like taking back a sweater?" O'Neil asked.

"My queen is generous. At my request, she let me choose a new host. Ayami took me willing. I did not force her."

"Ayami...your host?" Daniel said, astonished.

"Yes…" Tsukuyomi said softly. Again she eyed them with suspicion. "If you are who you say you are…if you know of the Tok'ra…will you take me to them?"

"What, so you can tell your queen where they are and get a promotion?" O'Neil snorted.

"So I can join them!" Tsukuyomi retorted.

Everyone stared at the young goa'uld, too shocked to speak. She edged away, glaring at them.

"Carter," O'Neil whispered, "what the hell is going on here?"

"She's obviously not a normal goa'uld," Carter shrugged, "we'd be dead by now if she was, or being transported to see her queen. She seems afraid, she doesn't want to kill us…she's asking about the Tok'ra. Think how it would be on earth if you were trying to join the Mafia or the Triads or something. It's not something right minded people want to be a part of."

"You're saying she's…a rebel?"

"Yeah, it looks that way. Besides…the Tok'ra must recruit from somewhere. Maybe this is how it's done; disillusioned goa'uld go and seek them out…"

"Will you take me to them?" Tsukuyomi demanded. Her eyes flared. "I can still have you executed if you refuse!"

"Ah!" O'neil grinned. "But if you did that, you'd never find them would you? Besides, you don't want to risk us escaping and spreading the word that you're a Tok'ra wannabe." He winked. "Best to keep us alive."

Tsukuyomi bit her lip, and lowered her gaze, apparently defeated. O'neil frowned. "If you don't…mind me asking…you seem a little sedate…for a goa'uld…am I right in thinking you're not entirely happy with your lot here?"

"I am not." She answered. "I am made to do things that I would rather not do. I am my queen's favorite. I am rewarded with gifts and soldiers for doing as she bids. But there is much I am not permitted to do, and I am weary of it. All goa'uld yearn for power…but some of us are just not strong enough to attain it."

"You're giving in?" O'neil almost laughed. "Boy do I wish I could get this on camera; a depressed goa'uld!"

"What won't Amaterase let you do?" Daniel asked gently.

"I may not go anywhere beyond this vessel without an escort, and if I do, I must provide a reason. Permission must first be given before I can depart, and my jaffa are ever watchful. I would like to see other worlds. Speak to others of my own kind…even to walk the streets in the cities of our home world and speak with Jaffa who are not mere soldiers." Her expression darkened. "I am a prisoner on this ship."

"You're a pampered pet who wants out?" O'Neil remarked.

"I do not appreciate the term 'pet'." Tsukuyomi warned, and her eyes glowed dangerously. "Were I like my queen, I would have you killed just for uttering such an insult!"

"But…you're not your queen, are you?" O'Neil sighed.

Tsukuyomi looked away. "No…" she said softly. "As you said…I need you alive. You may be my only chance at salvation. The Tok'ra, I have heard, share my ideas about the taking of hosts, and deplore needless killing as I do. I am loyal to my queen…but I cannot stand this existence for much longer." She looked at them pleadingly. "You must help me."

"Well, it's easy." O'Neil said. "You let us out of this room, we'll take you with us." He paused. "With regards to unnecessary killing…you realize we may have to take out some of your jaffa to get to the stargate."

"No."

No?" O'Neil cocked an eyebrow.

"We shall devise a plan; some reason for me to be in your company, outside of the vessel. My First Prime must come with me…but he is only one man. We can escape from him without killing him."

"Won't your queen simply kill him anyway when she finds he let you escape?" Daniel asked.

To everyone's surprise, Tsukuyomi slumped her shoulders in defeat. "Yes…" she turned away and padded back to the door. "I…I had not considered that…"

Again, O'Neil leaned over and whispered to Carter. "She's kinda…simple…isn't she?"

"She's probably been locked up in this ship for centuries…she's never been out…never led an army…probably never had to worry about the threat of assassination because her queen dotes on her so. I mean she even visits her prisoners alone and unarmed. "It's inexperience, I think, Colonel, not stupidity."

"Just checking…" O'Neil smirked. "Well," he began, addressing the group in general. "Shall we make a move? I expect we should think about leaving before your queen turns up?"

"Yes," Tsukuyomi agreed, "I must first – "

She was interrupted by a sound, and looked around, dismayed.

"An alert." Teal'c reported. "Security has been breached."

"I must go and see to it!" Tsukuyomi said. She opened the door, then hesitated, regarding her prisoners uncertainly. "I…do not think you need to be restrained. You have not harmed me, and I intend our venture to still proceed. Come with me, but say nothing to anyone!"

Together, they hurried down the corridors to the throne room. Tsukuyomi's First Prime was there, along with two other jaffa, who had between them a man. A man with curly brown hair and the most absurdly long scarf imaginable.

Tsukuyomi eyed their prisoner with interest. She turned to SG-1. "Another member of your survey party?"

"No…" O'Neil said. "As you can see, we have a certain dress code." He patted the front of his military uniform.

The prisoner glared at him. "What are you implying?" He demanded.

"Nothing…" O'Neil said simply, "nothing at all…"

Tsukuyomi addressed her servants. "Jaffa, who is this human? Where did you find him? I ordered you to keep watch at that Chappa'ai for other intruders."

"No one has come through the Chappa'ai, Lady." Her first Prime dropped to one knee and kept his gaze on the ground as he spoke. "This one was apprehended near the entrance to the ship. We do not know how he penetrated so far beyond our perimeter. As per your request, we did not kill him, but brought him back to you, for your pleasure."

"Pleasure?" O'Neil perked up. "I hope that doesn't mean what I think it means."

Tsukuyomi gave him a dangerous look, and O'Neil smiled. "I guess…it doesn't…"

The young goa'uld stood mere feet away from the prisoner and looked him over. "Leave him here. He will join me. There is much I must ask of him. You, jaffa, shall wait beyond the doors of this chamber. You are not to intrude for any reason, save by our queen's own order."

The jaffa bowed and released the prisoner. They left. The prisoner dusted himself down and muttered. "Another warm welcome." He looked up and offered his hand to his captor.

"Amaterase?"

"No…" she faltered. "Tsukuyomi…"

"What…Tsukuyomi?" The prisoner looked puzzled. "I see, you're…not the person I should be speaking to. Have I come to the right place? You see it's just that my mode of transport is rather temperamental at the best of times and I really must speak to – "

"My queen shall arrive shortly." Tsukuyomi interrupted. "Are you from the Tau'ri as well?"

"Earth?" The prisoner retorted. "Me? From Earth?" He leered so close that Tsukuyomi stepped back in apprehension. "I'm a Time Lord. And time is of the essence! Where is that queen of yours then? She's about to make the blunder of the millennium! I've got to stop her!"

Tsukoyomi stared at her newest prisoner, fascinated at his behavior. The team of SG-1 were not so easy to amuse. O'Neil raised his hand. "Um…this may seem and…odd…question…" he looked at the Doctor askance, "but…who are you?"

The Doctor grinned. "Who indeed? I'm the Doctor."

"The…Doctor?" O'Neil cocked an eyebrow.

"Yes, that's right."

"Doctor…of what?"

"Just Doctor."

"Just Doctor…I see…" O'Neil turned to his team and rubbed his temples. "Any ideas on this guy?"

"None." Carter muttered.

"Not exactly a usual mission huh?" Daniel sighed. O'Neil gave him a fake smile that read shut up.

"We must leave." Tsukuyomi said suddenly, to the astonishment of all present.

"Leave?" The Doctor faltered. "But I only just arrived! I thought your queen was coming. It's imperative that I speak with her."

"We must not be found here!" Tsukuyomi said desperately. "If she comes and I am here, I will be made to execute you. If I leave, and you stay, she will torture you. Come," she turned to O'Neil, "keep your word; take me to the Tok'ra!" A strong arm grabbed her shoulder and spun her around.

"Listen," the Doctor said intensely, "your queen is about to doom herself and the Earth along with her. You are in her employ, has she told you why you're here?"

"I am here to oversee the work…" Tsukuyomi faltered.

"Yes, yes, but do you know what that work is? Do you know what she's doing out here on this desert planet? Anything about salvaging advanced technology? Detections of peculiar signals? Buried treasure? Impending invasion, that sort of thing?"

Tsukuyomi looked blank. "I am here to oversee the work. I admit though, I am unsure as to what exactly the work is."

"What…" the Doctor stared at her in appalled disbelief. "You…a god to your people, to your servants and to your soldiers and you don't even know why the lot of you are here?"

"I know only that it involves excavation. Apparently, we are extracting something from this planet's surface."

"How could you not know why you are here?" The Doctor asked painfully.

"My queen keeps her own secrets." Tsukuyomi answered. "What business is it of yours?"

"Because if I knew now exactly what was hidden here and where, and what Amaterase intended to do with it…I could possibly diffuse the situation before it begins. That is assuming it hasn't begun already…"

The ring teleporter in the room activated. Before anyone could respond, they found Amaterase staring back at them, flanked by four jaffa. Faced with possible intruders, the jaffa raised their staff weapons and prepared to open fire.

"No!" Tsukuyomi commanded, stepping in front of her companions.

Amaterase was not impressed. "Tsukuyomi. Explain yourself. What is this? Why do you have slaves here, in this of all rooms? Answer quickly, or they will die."

"I…" Tsukuyomi hesitated.

"Oh God…" O'Neil muttered, covering his mouth with his hand. "She looks like a kid caught having a party whilst her mother was out…"

"I…" Tsukuyomi looked this way and that, in a pathetic attempt at trying to conceal her panic.

"We're just old friends, dropping by." The Doctor smiled. "We've come with some very useful advice too. I take it you are Amaterase?"

"Come no closer!" the System Lord shouted, raising her arm. The ribbon –device on her hand flared.

"I'll take that as a yes," the Doctor grinned. "Now Amaterase…what I came to tell you is this; whatever you're doing here on this planet, you have to stop it!"

"I do not take counsel from slaves!" Amaterase sneered. "Jaffa, kill them."

No, you don't understand – "

The jaffa fired. The members of SG-1 gasped in horror; Tsukuymomi ran forward and shielded the Doctor from the worst of the blast, and lay, bloody and broken before him.

They were not the only ones aggrieved.

Amaterase stared at the body in dismay. The jaffa froze, terrified by what they had done, and looked fearfully to their goddess for instructions or punishment.

Silently, and slowly, Amaterase came to Tsukuyomi's side. "Jaffa…place her in her sarcophagus. Guard her. When she has risen, you will bring her before me." Two Jaffa knelt down and reverently took Tsukuyomi's body away. Amaterase turned to the intruders and her eyes glowed menacingly. "I will not kill you yet. You must have some worth, or else Tsukuyomi would not have behaved in such a disgraceful way. Jaffa, take them to the cells. If they escape, your lives are forfeit."