The third series of the hit teen drama, which went into production earlier this month, welcomes former Girl star Jemima Kirke as one of the newcomers.
Kirke will play Hope, a graduate of Moordale School, who returns as the new headmistress with a very specific idea of how she wants the school to run.
Elsewhere, Harry Potter star Jason Isaacs plays Peter Groff, the older brother of much-maligned former head Mr Groff – and Peter is described as “more successful/less modest” than his younger brother.
Rounding up the newcomers is performer Dua Saleh, who will play a nonbinary student Cal joining Moordale who is set to clash with new head Hope.
As the show goes into production, Isaacs discussed how strange it was to be back filming during the ongoing coronavirus crisis.
Speaking on Twitter, the star said: “On a set again after what seems like decades. It’s both extremely weird and disarmingly normal, despite all the masks, tests and colour zones.
— dua saleh (@doitlikedua)September 24, 2020
“Doing a lot of acting. Forgive me, it’s been building up.”
Sex Education has been hugely popular since it first launched on Netflix in 2019.
The show’s second season sees a number of shocking revelations, with the final episode seeing a number of students taking part in a musical edition of Romeo and Juliet.
Maeve (Emma Mackey) struggled with her relationship with her mother Erin (Anne-Marie Duff), and decided to call child services to help her three-year-old sister when she discovers her mother was still using drugs.
Elsewhere, sex therapist Jean (Gillian Anderson) discovers she is pregnant after breaking up with boyfriend Jakob (Mikael Persbrandt).
Sex Education is set to air on Netflix next year