Grigori was a recurring antagonist in the third season of Stranger Things. He was a Soviet soldier and KGB officer acting as an enforcer/hitman under the command of General Stepanov. He was present in the United States during the Soviet Union's secret operation in Hawkins, Indiana, in which a secret facility was constructed under Starcourt Mall. Grigori was one of various operatives tasked with keeping the operation secret, using lethal force if necessary. When local police chief Jim Hopper and associate Joyce Byers began investigating the conspiracy in the summer of 1985, Grigori was ordered to kill them, as well as kidnapped Russian scientist Dr. Alexei. Grigori was also used to intimidate Larry Kline, the corrupt local mayor who facilitated the construction of Starcourt and the secret facility. Grigori and Hopper had various violent encounters at multiple locations around Indiana, including the abandoned Hawkins Lab and the local Fun Fair. This culminated in a fistfight in the underground facility, in which Hopper finally overpowered and killed Grigori by throwing him into the machine. He is portrayed by Andrey Ivchenko.