Millie Bobby Brown as Eleven
| Age | 18 years |
Finn Wolfhard as Mike Wheeler
| Age | 19 years |
Noah Schnapp as Will Byers
| Age | 17 years |
Gaten Matarazzo as Dustin Henderson
| Age | 19 years |
Caleb McLaughlin as Lucas Sinclair
| Age | 20 years |
Sadie Sink as Max Mayfield
| Age | 20 years |
Natalia Dyer as Nancy Wheeler
| Age | 27 years |
Charlie Heaton as Jonathan Byers
| Age | 28 years |
Joe Keery as Steve Harrington
| Age | 30 years |
Maya Hawke as Robin Buckley
| Age | 24 years |
Winona Ryder as Joyce Byers
| Age | 50 years |
David Harbour as Jim Hopper
| Age | 47 years |
Cara Buono as Karen Wheeler
| Age | 48 years |
Priah Ferguson as Erica Sinclair
| Age | 15 years |
Matthew Modine as Martin Brenner
| Age | 63 years |
Jamie Campbell Bower as 001/Vecna/Henry
| Age | 33 years |
Paul Reiser as Dr. Sam Owens
| Age | 66 years |
Dacre Montgomery as Billy Hargrove
| Age | 27 years |
Joseph Quinn as Eddie Munson
| Age | 29 years |