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Netflix announced on Monday that the show will return for another 10 episodes in 2021.
The third series was a big hit when it was released last November. Understandably, the show's creator Robia Rashid is made up that they've been given the chance to bring the series to a decent conclusion.
She said: "I'm thrilled we'll be doing a season four of Atypical.
"And while I'm so sad to be nearing the end of this series, I am extremely grateful to have been able to tell this story.
"Our fans have been such beautiful, vibrant supporters of this show. Thank you for being so open to Sam's voice and stories, and those of the entire Gardner family.
"It's my hope that the legacy of Atypical is that more unheard voices continue to be heard and that even after this series ends, we keep telling funny, emotional stories from underrepresented points of view."
If you've not seen the show, you can go and catch the previous three seasons on Netflix right now. It's a coming of age comedy about Sam, a 19-year-old who is on the autistic spectrum, and the trials and tribulations of his life and search for independence.
Keir Gilchrist plays the lead role, but the show also stars Jennifer Jason Leigh, Michael Rapaport, Brigette Lundy-Paine, Nik Dodani, Jenna Boyd, Amy Okuda, Graham Rogers and Fivel Stewart.
Those actors, plus a whole host of others, will feature in the show's swansong season.
The series is written, created and executive produced by Rashid, alongside fellow exec-producers Seth Gordon and Mary Rohlich.
In terms of reaching four seasons, Atypical is somewhat - well - atypical. In fact, Netflix tends to try to wrap up their originals early on.
To date, around 10 of the scripted originals Netflix has commissioned have ended after four or more seasons, according to the Hollywood Reporter. The vast majority of them get the axe after just one or two run-outs.
In fact making it to three is relatively rare. That means that the Atypical lot must be doing something right.
Netflix works out whether to give shows another go based upon the show's viewership, which is a mysterious way the company has never revealed the specifics of, against the cost of another run.
Then, they work out whether that resource would be better served making new shows.
It seems as if the numbers - whatever they were - worked in favour of Atypical.
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