The TARDIS materialized quietly. The Doctor had not left the parking break on because secrecy was more important this time. He and Rose stepped out of the TARDIS.
"Planet Earth, New Mombasa year two thousand five hundred fifty two." He said in hushed tones.
"What are we doin' here then?"
"I don't know, but the TARDIS wouldn't have taken us here unless it was important. This is the middle of a war Rose."
"What do ya mean a war?" Asked Rose, much louder than the Doctor would have liked. He shushed her and crept forward. Suddenly gunshots ripped the air and the Doctor jerked backwards faster than was humanly possible. He went to Rose's side.
"Rose maybe you should stay near the TARDIS for this one."
"Why? I get that it's dangerous, but what's so bad? I mean this is earth." The Doctor looked solemnly at her.
"There are aliens invading the Earth. They call themselves the Covenant."
"What kind of aliens are they?"
"The Sangheili are huge, around eight or nine feet tall. They have some very nice armour around this time. Then there's the Kig-yar, the San 'Shyuun, the Unggoy, the Lekgolo, really wanna watch out for those ones Rose. Let's see there's also the Huragok, the Jiralhanae and the Yanme. All are various scary looking aliens. Probably frightened the humans half to death landing on their planet like this." More gunshots pierced the air and the Doctor looked around with concern.
"It's not safe for you here Rose. Get back inside." Rose shook her head and opened her mouth to protest when she was rather rudely interrupted. The interruption came in the form of a solid blow to the back of her head. As Rose collapsed a Sangheili materialized behind her brandishing it's weapon and roaring. The Doctor scarcely had time to wonder where it had appeared from, when he too was bashed unconscious.
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The Doctor was being gently shaken. When he opened his eyes the first thing he noticed was a very tall person in green armour bending over him. The visor on his helmet was tinted gold so the Doctor had no clue as to who was inside. He sat up slowly, the pain in his head spiking as he did so. He shut his eyes for a moment until it abated.
"Rose?" He asked, looking around. There was no sign of her. "ROSE!" He shouted jumping to his feet. His head exploded with pain and he would have fallen, but for the arm that extended to catch him.
"Easy there." Said a deep, masculine voice. "What is a civilian like you doing out here? I thought you were all evacuated." The man's tone was clearly disapproving.
" 'm not a civilian," gasped the Doctor as he flashed his psychic paper.
"Master Chief Petty Officer Spartan 117, reporting for duty Major Smith SIR!" The Doctor regained his composure.
"Very good, no need to Sir me though Chief." He felt around the back of his head and his breath hissed out when his fingers came away tacky with blood.
"Permission to perform first aid SIR!" The Doctor winced.
"Go ahead soldier." The Chief pulled a spray can with a long nozzle out of a pouch on his armour. He pressed the end to the Doctor's head and pulled the trigger. The foam that emerged from the can burned and stung like nothing the Doctor had ever felt before. He whimpered in pain, eyes watering. After several moments of agony the headache and sharp pain had disappeared. He touched the back of his head wonderingly.
"Thank you. Have you seen Rose around? Smallish girl, bout up to here," the Doctor gestured towards his chest. "Very blonde. Doesn't understand the concept of not wandering off."
"Sir permission to speak candidly."
"Granted," sighed the Doctor.
"I saw a girl fitting that description being dragged away by an Elite zealot just as I got here. The one that was about to finish you off is over there." The Doctor supposed Elite was some form of human slang for the Sangheili. He looked over towards the body and saw it was indeed Sangheili. The sight made the Doctor's hearts constrict. No creature deserved to be so mercilessly slaughtered.
"Well if they've taken her prisoner I suppose we had best go find her." The great man before him crossed his arms.
"The Elites don't take prisoners." He stated flatly.
"We'd better move quickly then."
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The Doctor and the Spartan had been running for quite some time, trying in vain to track the Elite that had stolen Rose. The Doctor was reluctant to call them Elites, but it seemed most humans didn't recognize them as Sangheili and while "Elite" wasn't really derogatory he felt that they would only be angered by the lack of recognition. They paused for a moment in their frantic search so the Doctor could catch his breath. He was physically superior to most life forms, but for some reason this huge man wasn't even breathing heavily. The Doctor slyly drew his sonic screwdriver and set it to silent. Normally he really liked the noise it made, but he felt that this giant man wouldn't enjoy being scanned. He stealthily aimed the sonic at 117 and as the results came in he had to bite back a gasp. The man was human alright, but some sort of augmented one. His white blood cell count was very low, his bones were virtually unbreakable, his muscle tissue was incredibly dense, his eyesight was better even than the Doctor's, and his reflexes were significantly faster than any life form the Doctor had ever seen. While the Doctor had been examining the Chief a small alien had snuck up behind him. He was unaware of it's presence until it rested a small blue tentacle on his shoulder. The Doctor stood very still. The Spartan in front of him whipped around, gun drawn.
"Get down!" He shouted. The Doctor looked calmly down the barrel of his MA5B.
"I'm not moving. Put your gun down." Master Chief hesitated. "NOW SOLDIER!" The super-human lowered his weapon.
"Sir! That is a Covenant alien. It must be neutralized. Sir!"
"You will do no such thing. This is a Huragok it's harmless. All they are is biological super computers. These little guys wouldn't hurt a fly," saying this the Doctor reached out and rubbed the head of the Huragok. The Chief tensed as they made contact.
"Sir, Engineers are still part of the invading force. They are our enemies." The Doctor half turned around to glare at him.
"They are not." He said indignantly. "The Covenant probably would have left you lot alone if you weren't such war-mongering apes." The Engineer tapped on his shoulder and he turned back to it. It waved it's many tentacles around.
"It's going to attack!" Shouted Master Chief.
"It is not!" The Doctor shouted back. "This is it's way of communicating. The Huragok only speak in sign language." What is going on? The engineer wanted to know. Why is that human yelling? The Doctor petted it's head gently. He thinks your dangerous he signed. I only wanted to fix that thing you have, it replied. My sonic? Ok show me what you can do. He handed the alien his sonic screwdriver. The Engineer looked it over for a moment, and then faster than the Doctor's eyes could follow, he had taken it apart and repaired it. Thank you what did you do? Asked he asked wonderingly. I fixed it, replied the odd little thing and then floated serenely away. The Chief shifted uneasily at the exchange.
"I don't like this." He said softly to Cortana.
"Well he certainly has a way with the enemy." She replied in equal tones.
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AN: I hate myself a little for writing a crossover XD I was forced to by my older brother, but whatevs I think it's going all right.