Serafinowicz (Spaced, Couples Retreat) will play seedy cupboard salesman Eric Dunt in the highly-anticipated show.
© Sky
Dunt's character realises he can make a killing on the island of Jinsy when the residents mistakenly believe that he is The Great He, a hugely worshipped but never seen figure on Jinsy.
Serafinowicz will appear in the second episode of the Chris Bran and Justin Chubb-written series.
Harry Hill and David Tennant are among the guest stars also appearing in Jinsy.
