Question: Which character did Richard Haydn play in the 1945 film "And Then There Were None"?

Context paragraphs:
Bhai Jaan: Bhai Jaan (1945 film) is a Bollywood film.  It was released on 15 September 1945 in Bombay.  Directed by Syed Khalil.  The actors were Karan Dewan, Noor Jehan, Anees Khatoon, Meena Shorey, Shah Nawaz, Ansari and Nazir.  It was a family drama, made under a banner of United Films.  The print has been lost now.  1945.

The Sound of Music (film): The Sound of Music is a 1965 American musical drama film produced and directed by Robert Wise, and starring Julie Andrews and Christopher Plummer, with Richard Haydn and Eleanor Parker.  The film is an adaptation of the 1959 Broadway musical of the same name, composed by Richard Rodgers with lyrics by Oscar Hammerstein II.  The film's screenplay was written by Ernest Lehman, adapted from the stage musical's book by Lindsay and Crouse.  Based on the memoir "The Story of the Trapp Family Singers" by Maria von Trapp, the film is about a young Austrian woman studying to become a nun in Salzburg in 1938 who is sent to the villa of a retired naval officer and widower to be governess to his seven children.  After bringing and teaching love and music into the lives of the family through kindness and patience, she marries the officer and together with the children they find a way to survive the loss of their homeland through courage and faith.

The Return of Charlie Chan: The Return Of Charlie Chan is a 1973 American film.  It stars Ross Martin, Richard Haydn, Louise Sorel and Leslie Nielsen.

Young Frankenstein: Young Frankenstein is a 1974 American comedy horror film directed by Mel Brooks and starring Gene Wilder as the title character, a descendant of the infamous Dr. Victor Frankenstein.  The supporting cast includes Teri Garr, Cloris Leachman, Marty Feldman, Peter Boyle, Madeline Kahn, Kenneth Mars, Richard Haydn and Gene Hackman.  The screenplay was written by Wilder and Brooks.

Miss Tatlock's Millions: Miss Tatlock's Millions is an American screwball comedy film directed by Richard Haydn in 1948.

Richard Haydn: George Richard Haydn (10 March 1905 – 25 April 1985), known as Richard Haydn, and born as George Richard Haydon, was an English comic actor in radio, films and television.  Some of his better known performances include "Ball of Fire" (1941) as Professor Oddley, "No Time for Love" (1943) as Roger, "And Then There Were None" (1945) as Thomas Rogers, "The Emperor Waltz" (1948), "Alice in Wonderland" (1951) as the Caterpillar, as Baron Popoff in "The Merry Widow" (1952), as William Brown in "Mutiny on the Bounty" (1962), and "The Sound of Music" (1965) as Max Detweiler.

And Then There Were None (1945 film): And Then There Were None is a 1945 film adaptation of Agatha Christie's best-selling mystery novel of the same name, directed by René Clair.  It was released in the UK with the title Ten Little Indians, in line with the UK title of Christie's novel.

The Foxes of Harrow: The Foxes of Harrow is a 1947 adventure film directed by John M. Stahl.  The film stars Rex Harrison, Maureen O'Hara and Richard Haydn.

Forever Amber (film): Forever Amber is a 1947 American romantic drama Technicolor film starring Linda Darnell and Cornel Wilde.  It was based on the book of the same name by Kathleen Winsor.  It also starred Richard Greene, George Sanders, Glenn Langan, Richard Haydn, and Jessica Tandy.

Mr. Music: Mr. Music is a 1950 film starring Bing Crosby and Nancy Olson, directed by Richard Haydn, and released by Paramount Pictures.  Filming took place from October to December 1949 in Hollywood.

Supporting paragraphs: Richard Haydn And Then There Were None (1945 film)
Answer: Roger