Ripper Street will move to BBC Two when it returns to television screens later this month.
The period crime drama launched on BBC One in December 2012 and the fourth season premiered exclusively on Amazon Prime Video earlier this year.
Shameless star David Threlfall and Harry Potter actor Matthew Lewis join returning regulars Matthew Macfadyen, Jerome Flynn, Adam Rothenberg, MyAnna Buring and Charlene McKenna for the seven new episodes.
Other new cast members include Jonas Armstrong (Robin Hood), David Warner (The Omen) and Killian Scott (Calvary).
Season 4 is scheduled to begin on BBC Two in the fourth week of August.
Three years have passed since Reid left the heaving maelstrom of Whitechapel for a life of quiet contemplation by the sea with his daughter. However, he finds himself drawn back to the naphtha glare of those East London streets when he learns that Isaac Bloom, a Jewish mathematician who helped Reid on two previous Whitechapel investigations, is set to hang before the week is out.
Amazon confirmed in March that Ripper Street will come to an end with its fifth season later this year.
Watch the Season 4 trailer…
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