The sky over New York was peaceful except for the odd bird and plane as they came in to land or to take off. The sun was setting in the distance, the skyscrapers' shadows stretching across the city. People were travelling home from a long day's work as others began the night shift. Lights were coming on all over the city as it darkened; it was one of the most peaceful nights ever in New York.

However, the peace was not to last. An enormous roar rang through the Times Square as a fire ball billowed out of the ground. As it cleared the pavement was all broken, smoke and vapour pouring out of a gaping hole and floating above, a large metal creature, who was snorting fire and glaring with massive red eyes at the people running around it.

Suddenly over head a large shape hovered into view, as it came in over the top of the creature. The craft emitted a large blue beam which covered the hostile element and seemed to hold it as the creature struggled against it.

Vehicles then began pouring into Times Square with soldiers wearing black outfits with Red berets running in sync next to them. These then proceeded to form a circle around the creature with their weapons pointing towards it.

"Stand ready," a female officer shouted.

"Um excuse me," a gentleman said coming up to the commanding officer, "what are you doing here, my people are on this thanks," he said pointing to the large craft hovering above.

"Sir we are U.N.I.T and we deal with cases such as this."

"Well I am with S.H.I.E.L.D and we deal with cases such as this too."

"S.H.I.E.L.D? Who are you?"

"I am Agent Coulson, who are you?"

"I am Captain Magambo."

"We were told to come and deal with this."

"No we were told to come and deal with this."

"You were both told to come here," a third voice chimed in.

The two turned to face a gentleman wearing a brown pinstripe suit, with a blue shirt, brown tie, brown trench coat and blue converses.

"Hello, I am the Doctor and you were both called here." He raised his right hand holding a cylindrical device. He pressed a button and a blue light emitted from the end, with a high pitch whining also coming. He pushed the emitter headed further out, as though he was increasing the power.

Suddenly, the creature disappeared, as did the smoke, vapour and the large hole.

"What is that?" Coulson said as the Doctor, switched off the device and returned it to his pocket.

"That is a Sonic Screwdriver. You were both called here by me, because I need U.N.I.T and S.H.I.E.L.D."

"Why Doctor, why now?" Captain Magambo asked.

"There is a large threat to this planet and I can't deal with it on my own, I need help. I have called you all because I need your team Agent Coulson and Captain, you no doubt have read my file and will know I used to work for U.N.I.T many faces ago. I need your technology at HQ in London to help. Are you willing to join me?"

"What are we facing? Coulson asked.

"There is a race of alien called the Zygons. They are nasty creatures, covered in red suckers and they have the ability to change their shape. A large group of them have invaded Earth and taken up positions in governments around the world, intending to turn countries against each other and in the chaos, claim the planet for themselves. But they are not working alone. They have formed a 'partnership' with a family of aliens from the planet Raxacoricofallapatorius. These Slitheen also like to disguise themselves. They are easier to spot, because they tend to occupy fatter people. You need to seek out these impostors, because if they are left to it, then the Earth will be no more."

He turned and walked over to a large blue box with the words 'Police Telephone Call Box' written on it. He placed a key in the door and then went inside. Seconds later a loud wheezing noise filled the air and the box began to fade in and out of sight, until both the sound and the box had disappeared.

"That's his TARDIS," the Captain said.

"Whatever that is," Coulson replied.

"It is his ship which he uses to travel in time and space with."