<Li> Lydia Wilson as Hermione "Mimi" Morton (Series 3 and 5), girlfriend of Homer Jackson and sister of Edgar Morton, current fiancé and employer of Rose Erskine . Later, she becomes protector of Reid, Jackson and Susan when they become fugitives attempting to outrun the law . </Li> <Li> Josh O'Connor as Police Constable Bobby Grace, junior constable in H Division . </Li> <Li> Anna Burnett as Mathilda Reid (Series 3 to 5), Reid's long lost daughter with whom he is reunited after she is discovered to have been held captive since her disappearance some six years previously in the SS Princess Alice disaster on the Thames . </Li> <Ul> <Li> Killian Scott as Assistant Commissioner Augustus Dove, a senior officer at Scotland Yard . Dove is known to have participated in corrupt activity, predominately associated with his long - lost brother, Nathaniel . </Li> <Li> Matthew Lewis as Sergeant / Inspector Samuel "Drum" Drummond, desk sergeant of H division who replaces the outgoing Sergeant Atherton . Drum is later promoted to Inspector by Augustus Dove . </Li> <Li> Benjamin O'Mahony as Detective Sergeant / Sergeant Frank Thatcher, Drake's right - hand - man . When Thatcher takes a disliking to Drake's successor, Inspector Shine, he is demoted and made desk sergeant . </Li> <Li> Anna Koval as Rachel Castello, a local reporter who takes over as editor of the Star newspaper following the murder of Fred Best by Theodore Swift . </Li> <Li> David Threlfall as Abel Croker (Series 4), a crooked Thames wharfinger and protector of Nathaniel Dove . When Croker is later murdered by Augustus, he produces evidence to suggest Croker was responsible for Nathaniel's crimes . </Li> <Li> Jonas Armstrong as Nathaniel Dove, Abel Croker's assistant and Augustus Dove's long - lost brother . Known as the' Whitechapel Golem', Nathaniel is responsible for a string of murders whereby the victims are bitten to death . </Li> <Li> Kahl and Kye Murphy as Connor Judge, son of Homer Jackson and Long Susan, who is born during her years of incarceration . </Li> </Ul>

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