Part of the crew from the American fishing boat, the Gettysburg, Samuel Holt is stopping over in the town of Wallace Harbour on Stewart Island, New Zealand. Holt leaves a local bar and comes across the Jenny-Thing, sat alone and crying in an alleyway. He goes to comfort her, but this turns out to be a ploy, and tentacles erupt from her body and stab him. However, she is unable to consume him, and it turns out that "Holt" is actually the Powell-Thing, who killed the man and took his form (making Holt's corpse resemble his own).
The following morning, the Powell-Thing (in Holt's form again) arrives at the Gettysburg, but R.J. MacReady and Detective Sergeant Rowan take him into custody and perform a blood test, indicating that "Holt" is a Thing. Powell-Thing then transforms into a monstrous form and tries to kill the two, but MacReady is able to set it alight with a flamethrower. As the Powell-Thing dies, it briefly takes on the shape all those it's previously infected, including Jenny... who MacReady and Rowan immediately realize wasn't a murder victim, and thus is obviously a Thing.