The Doctor passed Dean and Sam a gas mask. "Now I expect you to listen to me. When I tell you to run, run." That is all he said before putting on his mask. The started the pump and when the gas had reach a full circle they turned it off.
"Now what?" Sammy's muffled voice called.
"Wait." The Doctor said.
Little wisps of blue started to gather on the edge of the circle. More and more followed until they started to look like a blue smoke screen.
"Did you get us here just to show us a lights show?" Dean complained. The Doctor shook his head. Eventually a dark figure entered the middle of the circle and the Doctor took off his mask. Dean and Sam looked at each other then looked at the Doctor.
"Hello! I've been watching you and reading about you and it's seem pretty clear to me what has happened here. You're the Gelth, yeah? That's brilliant, it really is." The Doctor looks admiringly at the Gelth.
Dean started to take off his mask, but was admonished by Sam. He kept it on, but if proved even more difficult to communicate. "Gelth? What type of monster names themselves Gelth?"
The Doctor caught only little bits of the insult, but replied anyways. "The Gelth was a humanoid species, but during the Time War they lost their bodies. They're one of the older species in the universe. They're somewhat like me, but unlike me they have an actual population. The Gelth are actually pretty common because they're always trying to get they're human form back, but it usually doesn't work so I don't understand why they're still trying. They need a gaseous environment to survive and that's why I did this gas ring. I knew it would draw them in. The dark figure in the middle" the Doctor stops and points to the center. "He is Lovecraft. For some reason or another, the Gelth have accepted him, I figured, when we were in Baby that he was a Gelth after his reading showed gas. Dean, your car is leaking gas and that's why Lovecraft showed."
"Dammit! Sammy, I thought we fixed that leak!" Dean stared at Sam who was sitting on the pavement watching the Doctor. He only shrugged at his brother.
"That is also why I made you drive your car into town because I knew it would be fatal for your heart if we blew it up. The Gelth have been trying to get into the human world for years now because of the typical reasons. They want to take over the world and because they want to repopulate themselves with human bodies. I've had to close the Rift several times now, but they seem to be persistent. What an unfavorable mix-up! I actually thought I was out of my league here and I've stumbled across something new."
"So that's why the salt wasn't working? These guys feed off of gas and that's why none of our normal tricks worked?" Dean asked.
"Exactly, Dean and as for the static that is quite simple as well. Lovecraft is half Gelth and half Human spirit. He can come into human contact either through gas or through electricity. Quite brilliant actually. I applaud you for that Lovecraft. Though I do have some questions for Lovecraft, but since he's half and half he cannot speak clearly. We won't be able to get any answers. Thank you for the adventure and I hope to see you soon! Dean, Sam, go inside the Tardis and wait for me." Both of the two brothers listened and quietly went to the Tardis. Sam kept his head an inch outside of the door with Dean looking as well. The Doctor stepped back about twenty feet with a match.
"What is he doing, Sammy?" Dean asked, both of them have taken off their masks now.
"I have no idea, Dean, but I think he might be closing the Rift with fire. The actual liquid doesn't light, it's the fumes and when it does light it takes all of that toxic stuff and gets rid of it. If I'm correct then I think the Doctor is going to close off the Rift by choking them out." Sam explained. Dean stopped listening after the first sentence. This was all too complicated for him to get worked up over. He just wanted to get some sleep and some food.
"Try invading another time!" The Doctor threw the match and ran to the Tardis. The ring lit on fire. The Doctor shut the door and peered over the tall windows of the Tardis to watch the truck explode as well. Several pieces of shrapnel hit the sides of the Tardis.
"It doesn't explain why there were no people?" Sam questioned. The Doctor looked up and tossed his coat onto the pilot chair. He sighed and twisted a couple button. The Tardis started to shake and soon it was steady with a light swaying, as though it was a boat on open sea.
"The last thing Lovecraft said to me just then was he was writing a book; like we had predicted. He was showing the Gelth what humans reactions were when they thought they had ghosts." The Doctor was sad again as he explained this.
"Doc, I thought you said he couldn't communicate." Dean looked up accusingly.
"It was telepathic, Dean. I want to treat you guys to something, if you don't mind. You were both great companions and usually I allow only one trip for those I run into." The Doctor said.
Dean looked at Sam and he nodded. "Sure, where?"