Later this year Marcus can be seen opposite Killian Scott, Sarah Greene, Tom Vaughan-Lawlor and Conleth Hill, as Terence Andrews in 'The Dublin Murders,' an 8 part crime drama for the BBC, based on the bestselling novels 'The Likeness' and 'In the Woods' by Tana French.
He recently filmed 'Dev In America,' for TG4 in the role of Éamonn De Valera, which will be released in 2019.
In March of 2019 he embarked on a hugely successful national tour of the tense domestic thriller 'The Harvest' by Jane McCarthy.
In December of 2018 he appeared opposite Daniel Reardon in the gothic ghost story 'The Signalman,' by Charles Dickens, adapted for the stage by Jane McCarthy.
In July of 2018 he appeared to great acclaim in Samuel Beckett's 'First Love,' in the New Theatre, Dublin. In June of the same year he performed in the world premiere of 'The Harvest,' by Jane McCarthy, also in the new Theatre, Dublin, in which both he and the show received rave reviews. Both plays will begin a national tour in 2019.
In March of 2018 he performed 'First Love,' in a special one-off sell-out performance in Tullow Church, Foxrock, where Samuel Beckett attended service as a boy with his mother, a short distance from Beckett's childhood home of Cooldrinagh.
During 2017 Marcus appeared in the Dickensian feature film 'The Man Who Invented Christmas,' in the role of Bob Cratchit, opposite Dan Stevens, Christopher Plummer and Jonathon Pryce and directed by Bharat Nalluri.
Marcus appeared in Fair City for RTE television, in the role of Doctor James Oakley.
He recently finished filming Vikings season five earlier this year, for MGM/History Channel.
Marcus will soon be seen opposite Fiona Shaw and Alun Armstrong in 'Out of Innocence,' directed by British director Danny Hiller, which won 'Best Feature Narrative,' at the Buffalo International Film Festival.
In 2016 Marcus embarked on an extensive 5 month tour of 'Observe the Sons of Ulster Marching Towards the Somme,' by Frank McGuinness, in a co-production between the Abbey Theatre and Headlong Theatre Company, directed by multi-award winning and Olivier award-nominated director Jeremy Herrin. This tour of Britain and Ireland included performances in the Somme to mark the centenary of the battle of the Somme.
Marcus recently played Patrick Pearse in RTE's 5 part series 'Rebellion,' which can be seen on NETFLIX.
Marcus studied professional acting in the Gaiety School of Acting between 2002 - 2004 and in The Factory (now Bow Street) full-time Film Acting course in 2013. The youngest son of actors Peadar Lamb and Geraldine Plunkett, he has extensive experience of screen, theatre and voice-over work. As a fluent Irish speaker, he works in both English and Irish productions.
He has toured extensively with Druid Theatre Company to Australia, North America, Japan, Ireland and Europe, with their critically acclaimed shows 'The Playboy of the Western World' and 'DruidSynge,' directed by the Tony award winning Garry Hynes.
In 2014 he made his Abbey Theatre debut as Randall Utterword in GB Shaw's 'Heartbreak House.'
Marcus is also a versatile voice-over artist. His work includes many animated series, television and radio advertisements. He narrated 'Great Expectations,' by Charles Dickens for The Book On One (RTE radio 1) and has been the voice on campaigns for Ulster Bank on television, and has worked for many of the leading Irish animation companies including Salty Dog, Cartoon Saloon, Macalla, Abú Media, Glór Media, Ink and Light Films, RTE Jnr and Moetian Films where he regularly dubs animated feature films from Scandinavian to English. He is represented by VOICEBANK, voice-over agency.
He voiced many characters in the European animated series 'Simsala Grimm' (Magma films). He is the voice of Spongebob in the Irish language version of 'Sponge Bob Square Pants,' Cartman in the Irish Language version of 'South Park' and Wembley in the Irish language version of 'Fraggle Rock,' among many other productions.
Marcus is a member of Mouth on Fire Theatre Company, set up in 2010 to perform the works of Irish Nobel Laureate Samuel Beckett. The company's aim is to bring Beckett to the general public and to make his work accessible to everyone. In 2013 they will have brought the works of Beckett to Tokyo, Belgium and Russia. In 2015 he performed Beckett's 'The End,' for the inmates of both Mountjoy and Portlaoise prisons and both performances were enthusiastically received.
Having played Des O'Malley opposite Aidan Gillen in RTE's three part drama 'Charlie' in 2015, he returned to television screens as Patrick Pearse in the RTE series, 'Rebellion' in early 2016.
Marcus also reprised the role of Lucky in Gare St Lazare Players production of 'Waiting For Godot' in the Skirball Theatre, New York in late 2015, after their much lauded run in the Shanghai Repertory Theatre, Shanghai in 2014.