The best way to know if a series is about to end is when the cast drastically change their hair / facial hair.

Kit Harrington, for example, has said he's chopping off his locks and shaving his beard. Emilia Clarke has had short hair for a while now. This time, it's the kids from 'Stranger Things' chopping off their hair.

View this post on Instagram

Spy Kids 3-D: Game Over

A post shared by Finn Wolfhard (@finnwolfhardofficial) on

The rumours kicked off when Finn Wolfhard, who plays Mike Wheeler on the Netflix series, posted an image of his new hairdo on Instagram. Earlier in the week, Millie Bobby Brown - who plays Eleven - posted a number of very emotional videos on her Instagram stories that confirmed her filming on the series had ended.

Earlier this year, Netflix was forced to deny rumours about the Duffer Brothers leaving the series after its third season - which was itself pushed back to allow time for writing and filming. Given how the cast of 'Stranger Things' are getting picked up for movie franchises - David Harbour is leading 'Hellboy', Millie Bobby Brown is doing 'Godzilla: King of the Monsters' - it shouldn't come as a surprise that the series is closing in on an ending. Not only that, the cast received significant pay rises for its third season, with some of the cast picking up $350,000 an episode.

Yet, in spite of all this, Harbour told CNET in an interview a few weeks ago that the series could run for another two seasons. "It’s still being debated," said Harbour. " I know, somewhat, Hopper’s place in that story because the more you can know about the end of your story, the more you can set up … 'Stranger Things' has an arc to it that I understand. I feel very proud of that because we’re not going to get lost in our story and leave these strands. We’re going to tie things up."

'Stranger Things' returns to Netflix in Summer 2019.