Stranger Things features an expansive ensemble cast that has grown over its seasons. The actors you listed are the core group often referred to as "the party":

• Millie Bobby Brown as Eleven / Jane Hopper: A girl with telepathic and psychokinetic abilities who escapes a laboratory and is taken in by the town's police chief.

• Finn Wolfhard as Mike Wheeler: One of Will Byers' best friends and the de facto leader of the group, who develops a deep romantic connection with Eleven.

• Gaten Matarazzo as Dustin Henderson: Known for his encyclopedic knowledge of science and pop culture, he is the lovable, often chaotic, glue of the group.

• Caleb McLaughlin as Lucas Sinclair: A skeptical, street-smart member of the party who becomes a key defender against supernatural threats.

• Noah Schnapp as Will Byers: The boy whose disappearance in the first season kicks off the series' events and who maintains a haunting connection to the Upside Down.

• Sadie Sink as Max Mayfield: She joins the core group in the second season and quickly becomes an essential, sardonic, and resilient member of the party.