who are the main characters in the film?
Norwegian pilot, garry, R.J. MacReady, Dr. Cooper, Blair, Clark ,Childs, and others.,
The Thing (1982 film)
In Antarctica, a Norwegian helicopter pursues a sled dog to an American research station. The Americans witness the Norwegian passenger accidentally blow up the helicopter and himself. The Norwegian pilot fires a rifle and shouts at the Americans, but they cannot understand him and he is shot dead in self-defense by station commander Garry. The American helicopter pilot, R.J. MacReady, and Dr. Copper leave to investigate the Norwegian base. Among the charred ruins and frozen corpses, they find the burned remains of a malformed humanoid which they recover to the American station. Their biologist, Blair, performs autopsies on the remains and finds a normal set of human organs.

Clark kennels the sled dog, and it soon metamorphoses and absorbs the station dogs. This disturbance alerts the team and Childs uses a flamethrower to incinerate the creature. Blair autopsies the new creature and learns that it can perfectly imitate other organisms. Recovered Norwegian data leads the Americans to 
who was chasing the dog at the beginning of the thing A Norwegian helicopter.
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The Thing (1982 film) [SEP] Plot
In Antarctica, a Norwegian helicopter pursues a sled dog to an American research station. The Americans witness the Norwegian passenger accidentally blow up the helicopter and himself. The Norwegian pilot fires a rifle and shouts at the Americans, but they cannot understand him and he is shot dead in self-defense by station commander Garry. The American helicopter pilot, R.J. MacReady, and Dr. Copper leave to investigate the Norwegian base. Among the charred ruins and frozen corpses, they find the burned remains of a malformed humanoid which they recover to the American station. Their biologist, Blair, performs autopsies on the remains and finds a normal set of human organs.