There is a new batch of faces set to join the cast of 'Downton Abbey'.

It has been announced that ex-'EastEnder' Nigel Harman and 'Black Mirror' star Tom Cullen will be joining the regulars when the ITV period drama returns for it's fourth series in the autumn.

nigel harman

Nigel Harman is joining Downton Abbey

Harman - who played Dennis Rickman in the BBC One soap - has been cast as a visiting valet called Green, while Cullen will play Lord Gilligham, an old family friend of the Crawley clan, who might be the one to mend Lady Mary's (Michelle Dockery) broken heart.

They are set to be joined by Dame Harriet Walters as Lady Shackelton, a friend of the Dowager (Maggie Smith).

tom cullen

Tom Cullen's character has history with Lady Mary

There will also be appearances from opera star Dame Kiri Te Kanawa, who will play a singing house-guest, Joanna David, who's set to play the Duchess of Yeovil, and Julian Ovenden as Charles Blake, a visiting aristocrat.

Meanwhile, Shirley MacLaine is set to reprise her role as Martha Levinson, Lord Robert Crawley's freewheeling American mother-in-law.

Shirley joined the cast as Cora Crawley's (Elizabeth McGovern) mother in the first part of the ITV show's third series last year.

Siobhan Finneran, who plays scheming maid Sarah O'Brien, announced her departure from 'Downton' last week.

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