(In order of appearance- roughly)
Abigail Cowen as Ivy
Millie Bobby Brown as Eleven
Jamie Bower Campbell as Peter Ballard/001/Henry Creel
Noah Schnapp as Will Byers
David Harbour as Jim Hopper
Winona Ryder as Joyce Byers
Charlie Heaton as Jonathon Byers
Gaten Matarazzo as Dustin Henderson
Caleb McLaughlin as Lucas Sinclair
Priah Ferguson as Erica Sinclair
Finn Wolfhard as Mike Wheeler
Joe Keery as Steve Harrington
Joseph Quinn as Eddie Munson
Maya Hawke as Robin Buckley
Natalia Dyer as Nancy Wheeler
Grace Van Dien as Chrissy Cunningham
Sadie Sink as Max Mayfield
Dacre Montgomery as Billy Hargrove