1920s

  • Crossings: A Fairy Play (1925) as a Fairy with Angela Baddeley at the Amateur Dramatic Club (ADC) Theatre, Cambridge

  • Jean Stirling Mackinlay Children's Matinee: Dr. Doolittle's Play (1927) as Harlequin at the Rudolf Steiner Hall, London

  • Jean Stirling Mackinlay Children's Matinee: Dr. Doolittle's Play & King John's Christmas (1928) as Harlequin at the Rudolf Steiner Hall, London

  • Play written by Mrs Goring (1929) starring Marius in an outdoor performance at a moated medieval manor house

1930s

  • Les Femmes Savantes (1930) as Trissotin at the ADC Theatre, Cambridge

  • Several parts with the English Classical Players (1931) touring France and Germany

  • Hamlet and several parts with the Compagnie des Quinze (1931) in France and the Low Countries

  • Julius Caesar (1932) as a Spear Carrier at The Old Vic, London

  • Caesar and Cleopatra (1932) as Persian at The Old Vic, London

  • Cymbeline (1932) as Second Lord at The Old Vic, London

  • As You Like It (1932) as Le Beau at The Old Vic, London

  • Macbeth (1932) as Macbeth at The Old Vic, London. He undertook 3 performances as Macbeth when Malcolm Keen (Macbeth) and understudy Alastair Sim (Malcolm) were too incapacitated to perform

  • The Merchant of Venice (1932) as Salanio at The Old Vic, London. Directed by John Gielgud

  • She Stoops to Conquer (1933) as Aminadab at The Old Vic, London

  • The Winter's Tale (1933) as Cleomenes at The Old Vic, London

  • The Admirable Bashville (1933) as First Policeman with Anthony Quayle, Alastair Sim and Roger Livesey at The Old Vic, London

  • Romeo and Juliet (1933) as Romeo with Peggy Ashcroft as Juliet at The Old Vic, London

  • The School for Scandal (1933) as Trip with Alastair Sim, Peggy Ashcroft, Roger Livesey and Anthony Quayle at The Old Vic, London

  • The Tempest (1933) as Adrian at the Sadler's Wells Theatre, London

  • A Midsummer Night's Dream (1933) as a Faerie with the Oxford University Dramatic Society at Headington Hill Park, Oxford (outdoor performance). Produced & directed by Max Reinhardt

  • Twelfth Night (1933) as Sebastian at The Old Vic, London

  • Henry VIII (1933) as Cardinal Campeius/Garter King of Arms with Charles Laughton, Roger Livesey and Flora Robson at the Sadler's Wells Theatre, London

  • Measure for Measure (1933) as Friar Peter Abhorson at The Old Vic, London

  • The Cherry Orchard (1933) as Yepikhodov with Charles Laughton, Elsa Lanchester, Flora Robson and James Mason at The Old Vic, London. Directed by Michel Saint-Denis

  • The Tempest (1934) as Alonso at The Old Vic, London and the Sadler's Wells Theatre, London

  • Love for Love (1934) as Buckram with Charles Laughton, Flora Robson, Roger Livesey and James Mason at the Sadler's Wells Theatre, London

  • Macbeth (1934) as Malcolm at The Old Vic, London

  • The Voysey Inheritance (1934) as Hugh Voysey at the Sadler's Wells Theatre, London and the Shaftesbury Theatre, London which was his first appearance in a West End theatre

  • Hamlet (1935) as Hamlet (short version) and Fortinbras (long version) at the The Old Vic, London

  • Noah (1935) as Japheth with John Gielgud as Noah at the New Theatre, London. Directed by Michel Saint-Denis

  • Sowers of the Hills (1935) as Aubert at the Westminster Theatre, London. Directed by Michel Saint-Denis

  • The Hangman (1935) as Gallows Lasse at the Duke of York's Theatre, London

  • Mary Tudor (1935-1936) as Philip of Spain with Flora Robson as Mary Tudor at the Playhouse Theatre, London and the Sadler's Wells Theatre, London

  • Repayment (1936) as Paul Novak with Margaret Lockwood at the Arts Theatre, London

  • The Happy Hypocrite (1936) as Amor with Ivor Novello and Vivien Leigh at His Majesty's Theatre, London

  • The Ante-Room (1936) as Vincent de Courcy O'Regan with Diana Wynyard and Jessica Tandy at King's Theatre, Edinburgh and Opera House, Manchester

  • Girl Unknown (1936) as Max with Lucie Mannheim at the New Theatre, London. Produced by Lucie Mannheim

  • The Wild Duck (1936) as Gregers Werle at the Westminster Theatre, London

  • The Witch of Edmonton (1936) as Frank Thorney with Edith Evans, Alec Guinness and Michael Redgrave at The Old Vic, London. Directed by Michel Saint-Denis

  • Hamlet (1937) as First Player and Fortinbras with Laurence Olivier as Hamlet, Michael Redgrave and Alec Guinness at The Old Vic, London

  • Twelfth Night (1937) as Feste with Laurence Olivier and Alec Guinness at The Old Vic, London

  • Henry V (1937) as Chorus with Laurence Olivier as Henry V at The Old Vic, London

  • Satyr (1937) as Peter de Meyer with A. E. Matthews and Flora Robson at King's Theatre, Edinburgh and the Shaftesbury Theatre, London

  • A Woman Killed With Kindness - 5 scenes (1937) at the London Theatre Studio. Marius produced and directed this performance but did not appear in it

  • The Last Straw (1937) as Wolfe Guldeford with Lucie Mannheim at the Comedy Theatre, London. Produced and directed by Lucie Mannheim

  • Surprise Item (1938) as Arthur Primmer at the Ambassadors Theatre, London

  • Henry Irving Centenary Matinee - Scene from Louis XI (1938) at Lyceum Theatre, London

  • The White Guard (1938) as Leonid Schervinsky at the Phoenix Theatre, London. Directed by Michel Saint-Denis

  • Nora (1939) with Lucie Mannheim at the Duke of York's Theatre, London. Marius produced and directed this play but did not appear in it

  • Lady Fanny (1939) as Lord Bantock with Lucie Mannheim at the Duke of York's Theatre, London. He also directed this production

  • Nina (1939) as Schimmelmann with Lucie Mannheim at the Gaiety Theatre, Dublin and the Duke of York's Theatre, London. He also directed this production

  • Hamlet (1939) as First Player and Osric with John Gielgud as Hamlet performed at the Lyceum Theatre, London and at Kronborg Castle, Helsingør, Denmark

  • Great Expectations (1939-1940) as Pip at the Rudolf Steiner Hall, London. Play adapted by Alec Guinness from the novel by Charles Dickens