"What do you mean, 'we run'?" Dean demanded harshly. "People have died, Doctor, and there will be more if you let these things continue to live!" Sam looked around the room. "How many are there?" he wondered quietly. "Hundreds of thousands. It's a small swarm." he explained. Dean looked incredulous. "Small? Hundreds of thousands is a small swarm? Just how crazy are you?"
The Doctor ignored him and continued scanning the shadows. "Listen. You two need to get out of here. Your specialty is monsters? Good. Keep it that way and go hunt down something else." the Doctor commanded. Sam and Dean simply ignored his pleas and snatched the flashlight from his grip, swinging it around the room into the shadows. "So they're all around us? In every shadow?" Sam inquired. The Doctor sighed in frustration. "No, they're in any shadow, and I've already located the shadow which they are in. Now get out."
"Listen buddy. We aren't going anywhere, so it's in your best interests to just stop telling us to leave and work with us here. We need to figure out how to kill this thing because we sure as hell ain't going to let it continue living. Now help us out, Doctor." Dean said gruffly. The Doctor paused for a moment but then gave in. "Do you have lights?" he asked. "Do we have what?"
"Lights. Flood lights, torches, anything."
"Will black lights work?"
"No! Do you think black lights will work?" the Doctor spat. Seeming like he regretted saying that, he turned away. "Oh, that was rude, I'm sorry." he said quietly. Sam handed the flashlight to Dean and made his way through the kitchen to the front door. "What're you doing?" The Doctor demanded. With his hand on the knob, Sam opened the door before replying. "I'm going to go see if we have any lights. Do you need anything else?" he yelled into the living room. "No, just be careful! They move fast, so you'd better get back in here quick! And don't touch any abnormal shadows, don't even let your shadow touch any abnormal shadows!" the Doctor warned. He turned back to Dean. "I have to go get some suits. Stay here. Don't even move. If the shadows start moving, get out. I'll be back quick as I can." he said, inching around Dean and sprinting to the front door. He ran down the street, past Sam's car, which he was peering into the trunk of. "Doctor?" Sam called upon seeing the man pass. "What're you doing?"
"I have to get some suits! Don't come in here!" he replied, flinging open the door of the T.A.R.D.I.S. and ducking inside. After Sam fished out some flood lights, he shut the trunk, locked up the Impala, and was about to head inside until the Doctor's warning started ringing in his ear. Don't come in here. The Doctor had made a huge mistake. Now that Sam was curious, there was no way he could not go inside the mysterious blue box. He dumped the flood lights on the porch of the huge house and walked tentatively toward the thing, pushing open the ajar door and slipping inside quietly. He didn't know what he expected to find, but he found something much stranger. The relatively small box had an elephantine interior, with a high, domed ceiling and several hallways branching off of the main room, which seemed to be the control room. The entire place seemed... alien. Sam was just about to fly out of the box and tell Dean when the Doctor surfaced from one of the rooms, holding in his arms a bundle of white cloth and three helmets. He spotted Sam and his face grew red. "What're you doing in here!" he demanded. "I told you not to come in!"
"Oh, come on. You don't seriously expect me to leave it alone when you specifically tell me to stay out." Sam said with a shrug of his shoulders. "And anyway," he scooped the three helmets into his own arms, relieving the Doctor of that burden. "It looks to me like you need a little help."

"Put these on, and the helmets. Darken the visors so you have a less chance of getting infected." the Doctor commanded, tossing the brothers two white space suits and the helmets to go along with. He slipped into his quickly, so Sam and Dean decided to follow his lead. "Doctor..." Sam said, gesturing toward the kitchen. They left Dean to struggle with his suit while they conversed. "What was that box? The 'Police Public Call Box?" he wondered. The Doctor finished with the last zipper on his suit. "It's called a T.A.R.D.I.S. Time And Relative Dimensions In Space."
"And what does that mean?"
"It's a spaceship. My spaceship. Well, I stole it, but never mind that. It travels in time and space."
Sam was about to reply when Dean came stumbling in, having trouble with his suit. "I can't get this stupid..." he slipped and crashed to the floor of the kitchen, cursing. His brother helped him up and forced the suit on him as the Doctor grimaced. "I might've gotten you the wrong size..." he observed, much to Dean's dismay. "Ya think?" he exclaimed. The Doctor took care of all their helmets and darkened the visors with a swipe of his sonic screwdriver. "I don't want to have to tell you another time. Stay out of the shadows. Understand?" he demanded, throwing a pointed look at Sam, who nodded earnestly. Dean shrugged and grunted and stumbled back into the living room, scooping up the bundle of lights he had carried in from the porch earlier. "What d'you want us to do with these?" he asked, turning to the Doctor. "Set them up in a circle all around the room, the lights pointing out."
"Will that stop them?"
"No, but it'll slow them down. I've dealt with these before, trust me."
The Doctor plugged the lights into an extension cord sprouting from a port in the middle of the room, under a silver panel on the floor. Immediately, they flickered to life, illuminating the huge, unusually dark room. Dean held one of three flashlights, peering into the dark corners of the room. "I don't see anything different." he shrugged. The Doctor flicked out his sonic screwdriver, scanning the shadows Dean was trying to analyze. He showed Dean the readings and then scanned another, darker shadow in a different corner of the room. "This reading is different from the other. That's how we tell Vashta Nerada from regular shadows. Don't go anywhere outside this circle without my consent." he warned. Dean laughed airily. "Yeah. I think I get it, Doctor. We can't do anything without your okay, deal. Just don't treat us like amateurs."
"You are amateurs in my field of business." the Doctor retorted.