But before they moved on ahead to the series, there was still a ton to reflect on from the acclaimed first season, which was nominated for three Emmy Awards.
Harbour, who plays Chief Jim Hopper on the show, chose a moment from "Chapter Five: The Flea and the Acrobat."
In the scene, Hopper awakens in his home after being knocked out for discovering a portal in the research lab. He's obviously freaked out and begins to destroy his apartment, believing he's now being recorded.
The actor seemed to love the demolition aspect of the scene, which made him rank it as his favorite.
"In episode five, Hopper wakes up and thinks his house is being bugged and he tears everything apart. I literally destroyed the entire apartment for over a half hour," Harbour said.
Millie Bobby Brown
Brown, who plays the beloved Eleven, had two major scenes at the top of her list.
The first is the fan-favorite scene where Eleven steals Eggo waffles from a grocery store. The second was one of the trippier moments on the show, were Brown's character is subjected to sensory deprivation for research.
"I stole the Eggos from the supermarket. That was a really fun scene for me to film," Brown said. "And then the sensory deprivation scene was fun because it was such a big stunt."
Finn Wolfhard and Noah Schnapp
The two other child actors who sounded off on the question took it all the way back to the show's first episode, "Chapter One: The Vanishing of Will Byers."
Wolfhard (Mike Wheeler) and Schnapp (Will Byers) said that the opening Dungeons & Dragons scene was the favorite.
The boys' favorite board game has a major significance to the show's plot, but it also has a personal meaning to the kids. The mentioned D&D scene was the very first one they shot, which was the start of a life-changing journey for them.
Stranger Things' first season is currently streaming on Netflix, with the second debuting on Oct. 27.