Cult
The actor, who plays wildchild Chris in the E4 teen drama, will appear as a soldier who sees his comrades murdered by aliens.
However, he admitted that he had never watched the sci-fi hit before taking the part.
He told The Mirror: "I play a misguided soldier. To be honest I'd never seen the show before."
Other guest stars lined up for the fourth series include Alex Kingston, Sarah Lancashire and Felicity Kendal.
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