Channel 4 announced that the actor has landed the role of Rudy in the show.
Rudy is a replacement for the much-loved character Nathan, played by Robert Sheehan. It emerged last month that Sheehan has decided to leave the programme.
Rudy will meet the other characters - Kelly (Lauren Socha), Simon (Iwan Rheon), Curtis (Nathan Stewart-Jarrett) and Alisha (Antonia Thomas) - when he starts community service. However, he gets a "rude awakening" when he joins the group and is also struggling to keep his superpower a secret.
Gilgun recently appeared as Woody in the BAFTA-nominated show This Is England '86. He also previously starred as Eli Dingle in Emmerdale.
The new series of Misfits, which has been extended to eight episodes, is expected to air later this year on E4.
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