'Stranger Things' cast through the years: See Millie Bobby Brown, Finn Wolfhard grow up

Millie Bobby Brown has starred as the telekinetic Ele (short for Eleven) since she was 12 in Season 1.

After rocking a buzzcut in Season 1, Brown's Eleven returned for Season 2 with curly hair.

Brown's Eleven has plenty of challenges to navigate in Season 4 — including the treacherous social waters of high school.

Off camera, Brown, now 18, recently started sporting a new blond look. Here she is pictured at the Season 4 premiere in New York in May 2022.

In Season 1, Eleven found a close friend and confidante in Mike Wheeler, played by a 13-year-old Finn Wolfhard.

Wolfhard's Mike serves as the leader of the friend group on "Stranger Things.

Wolfhard also starred in the 2017 horror film "It" and voiced Pugsley Addams in the 2019 animated film "The Addams Family." Here he is at "The Addams Family" premiere in Los Angeles in October 2019.

Gaten Matarazzo, second from left, plays fan-favorite Dustin Henderson. He was 13 when the show came out.

In Season 3, Matarazzo's Dustin teams up with Robin Buckley (Maya Hawke) and Steve Harrington (Joe Keery) to unlock a mystery leading them to a Soviet base hidden underneath the town's mall.

Matarazzo spoke onstage at the Tony Awards in June 2022.

Caleb McLaughlin has played Lucas Sinclair, right, on "Stranger Things" since he was 14 in Season 1

Mclaughlin served this glam look on the red carpet at the Season 4 premiere.