Overview

• The upcoming fourth season of "Sex Education" will be its last, premiering September 21 on Netflix.
• The season will follow the characters beginning college and facing changes in relationships and new challenges.
• Some longtime cast members will not return for the final season, though main stars will reprise their roles.
• New cast additions include Dan Levy, Thaddea Graham, and Jodie Turner-Smith.
• The bittersweet final season is expected to bring closure while exploring new beginnings for the beloved characters.