In season 3 of "Stranger Things," Alexei demands a Cherry Slurpee before he will talk. Joyce Byers and Jim Hopper capture the Russian scientist because they need information about the secret machine beneath Starcourt Mall. Alexei initially refuses to cooperate, so Murray Bauman negotiates with him through translation.
Alexei's specific request is a cherry-flavored Slurpee, turning a tense interrogation into one of the season's funniest running jokes. Murray first brings him the wrong flavor, and Alexei immediately notices that it is strawberry rather than cherry. Once he receives the drink he asked for, he becomes more willing to explain the Russian operation and the machine's purpose.
Alexei is a Soviet engineer involved in opening the gateway beneath Hawkins. His love of Slurpees, cartoons and the amusement-park atmosphere makes him unexpectedly sympathetic. Viewers sometimes remember the scene simply as Alexei asking for a Slurpee, but the flavor matters: cherry is the canonical answer. He later dies at the Hawkins Fun Fair after being shot by Grigori.