DISCLAIMER: I DON'T OWN 'THE THING' (ORIGINALS AND PREQUELS)
In this second chapter, I'm gonna tell you in my own words how everyone got infected. Like I said in the previous chapter, I'll be happy to hear any opinions.
I'll be starting at the prequel which makes sense.
When the Norwegians and Americans were celebrating their discovery, Carter asked Griggs to bring more beers. At the same time Derek went to use the restroom. Then out of nowhere, Lar's dog sensed something bad coming so it tried to escape.
After Derek checked the alien in ice and almost having a heart attack when Peder spooked him, the alien escaped. Both Griggs and the dog heard the thing's roar. The dog was the first victim then Griggs (Thats what I believe). Henrik was next, unfortunately he didn't make it and neither did the 'Thing' when eveyone burned it. They all think it was over but looks can be deceiving.
After the scientists did their autospy, Juliette, feeling saddened for Henrik's demise, left. While crying, Griggs shows up and tries to comfort her but she tells him she wants to be alone. That's when the imitation of Griggs finds Juliette alone and starts to assimilate her while everyone else was preoccupied with the current situation.
Later, Carter and his crew were going to take Olav to Mc Mirtle (Out post North 31; I think). Kate found some fillings in the restroom also found a big puddle of blood in the shower. As the helicopter ascend in the air, Kate along with Edward were outside and she was trying to tell the pilots to land imidiately but it was too late, the Griggs imitation shows its true colors and attacked Olav forcing the copter to crash.
2 hours later the Juliette imitation tried to attack Kate, but she managed to escape however, Karl didn't make it and end up infected only for a short time (If you see the deleted scene he gets burned). Later on, after they put the surviving Americans in lockup someone or something burned the lab along with the blood serums and everyone was pointing fingers at each other until Kate reminded them of the 'Thing' can't imitate nonorganic. So they split up, those with metal fillings were Kate, Lars, Peder and Jonas while the rest didn't.
(I'm gonna fast forward a little bit. Bazinga)
After a little nasty explosion, which knocked out Edward, he or rather the imitation reveal thyself. And I bet you're wondering how?
I was looking back, and I think I might've found something. I believe that the fillings and puddle of blood that Kate found belong to Edward when he was in the restroom and he could've been attack by either Juliette or Griggs. And I also believe that it was the Edward imitation that sabotaged the blood serum test.
After revealing itself, part of the Edward imitation started to split up while the rest was trying to burn the Edward imitation. Looking back, I think part of the thing's hand went outside and collected the remains of Lar's dog and dragged it back to some random room where unfortunately that will be the same place where Colin enters and comits suicide.
I don't think I have to explain the rest since all of you already know how it ended but I do have one question though. When the thing grabbed one of Kate's legs before she got the grenade, wouldn't she have been infected but the process was taking it slowly? Perhaps we may or may not know.