Tate has signed up to appear in the third episode of the show, which is due to begin next month.
This Is Jinsy focuses on the residents of the fictional island of Jinsy.
Tate will star in the programme as Roopina Crale, the chief editor for Jinsy's magazine Glove Hygiene Monthly.
Roopina comes to Jinsy to carry out an interview, but it becomes clear that there may be a hidden side to her.
Images of Harry Hill, David Tennant and Peter Serafinowicz in This Is Jinsy have already been revealed.
Other stars scheduled to appear in the comedy include Jane Horrocks, KT Tunstall, Simon Callow and Kevin Eldon.
This Is Jinsy will premiere on Sky Atlantic in September.
Watch a trailer for This Is Jinsy below: