Stranger Things is one of the biggest shows on the air.
Premiering in the summer of 2016, the series was a hit from the get-go, but one of its stars initially thought the show was not going to be a success story.
David Harbour, who plays Hopper on the series, recently appeared on The Late Show with Stephen Colbert and opened up about his early reservations about the show.
"I was sure it was gonna be a complete disaster and a big failure before it came out," he said, before joking, "I remember when we were shooting, too, we would all sit around talking about how terrible it was gonna be, mainly because of my performance.
"I thought I was tanking the whole show. And then, before it came out, you normally see things on buses."
"I live in New York, I'm wandering around, buses, phone booths, there's ads for shows. Not a single ad."
Harbour said that one of his friends wondered whether Netflix was trying to "bury" the series ahead of its launch.
"And then the show came out and it was an overnight zeitgeist success."
"I really thought it was gonna be nothing and then people sort of embraced it and it became this grassroots event and it's very gratifying."
We've now watched three seasons of the show, with a fourth currently in the works. There's no telling how long the show will go on.
But it has featured excellent callbacks to the 1980s and that could b part of the success.
What we don't know is whether David Harbour will be back for the fourth season after the deadly third season finale.
There are a wealth of theories doing the rounds about what could be on the horizon for the characters.
Have a look at Harbour's appearance on The Late Show With Stephen Colbert below.
What are your thoughts on this?
Hit the comments below.
Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.