'Derry Girls' will return for an extended special following the season three finale.
'Derry Girls' will air one final extended special
The Channel 4 sitcom will return to Derry for one last time for a 45-minute episode titled 'The Agreement'. It will be set one year in the future as the gang prepare to leave school amid the backdrop of the Good Friday Agreement vote.
The historic agreement also clashes with the joint 18th birthday part for Erin (Saoirse-Monica Jackson) and Orla (Louisa Harland) as it threatens to be overshadowed by the vote.
The episode will air in the same week as the final episode of season three of the comedy, which will be broadcast by Channel 4 on May 17.
'Derry Girls' creator Lisa McGee said: "Like all the very best 90s bands, I couldn't resist ending our farewell tour with an encore to our loyal fans. I'm delighted to say we'll be returning for one extended special - airing in the same week as our final episode.
"The special deals with the historic and momentous Good Friday Agreement vote, which coincides with the gang's coming of age, they enter adulthood as Northern Ireland embarks on a new future."
She added: "I'm so proud of this show and of our incredible cast and crew and everything we've achieved over the last five years. What a journey it's been. I'm so grateful Channel 4 gave me the space to end the stories of these characters that mean so much to me with this special. I really hope fans love it as much as I do.
"Derry people aren't great at saying goodbye so I will instead use one of our native expressions 'That's us away now', Love Lisa McGee, always a Derry Girl."