Main Winona Ryder as Joyce Byers[4] David Harbour as Jim Hopper[4] Finn Wolfhard as Mike Wheeler[4] Millie Bobby Brown as Eleven / Jane Hopper[4] Gaten Matarazzo as Dustin Henderson[4] Caleb McLaughlin as Lucas Sinclair[4] Noah Schnapp as Will Byers[4] Sadie Sink as Maxine "Max" Mayfield[4] Natalia Dyer as Nancy Wheeler[4] Charlie Heaton as Jonathan Byers[4] Joe Keery as Steve Harrington[4] Dacre Montgomery as Billy Hargrove / Mind Flayer[4] Maya Hawke as Robin Buckley[4] Priah Ferguson as Erica Sinclair[4] Cara Buono as Karen Wheeler[4] Recurring Joe Chrest as Ted Wheeler[5] Andrey Ivchenko as Grigori[6] Brett Gelman as Murray Bauman[7] Cary Elwes as Mayor Larry Kline[2] Peggy Miley as Mrs. Doris Driscoll[8] Jake Busey as Bruce Lowe[2] Francesca Reale as Heather Holloway[3] Michael Park as Tom Holloway[9] Alec Utgoff as Dr. Alexei[10] Yasen Peyankov as Russian Scientist[11] Rob Morgan as Officer Powell[8] John Reynolds as Officer Callahan[8] Arthur Darbinyan as Doctor Zharkov Misha Kuznetsov as Commander Ozerov[8] Notable guests Sean Astin as Bob Newby[12] Catherine Curtin as Claudia Henderson[13] Randy Havens as Scott Clarke[14] Will Chase as Neil Hargrove[15] Christopher Convery as young Billy[16] Jacey Sink as young Max[17] Beth Riesgraf as Billy's mother[18] Gabriella Pizzolo as Suzie[19] Paul Reiser as Dr. Sam Owens[20] Serge Levin as Mechanic[21]