Question: The movie version of "A Dog's Purpose" by W. Bruce Cameron stars what Canadian theatre, film, and television actor?

Context paragraphs:
W. Bruce Cameron: William Bruce Cameron (born 1960 in Petoskey, Michigan) is an American author, columnist, and humorist.  Cameron is most famous for his novel "A Dog's Purpose", which spent 52 weeks on the "New York Times" bestseller list and is the first book in a two book series that concludes with "A Dog's Journey".  The book is the basis for the movie version starring Dennis Quaid, Britt Robertson, Peggy Lipton, K.J. Apa, Juliet Rylance, Luke Kirby, John Ortiz and Pooch Hall, an Amblin Entertainment/Reliance Entertainment/Walden Media release in theaters January 27, 2017.

A Dog's Journey: A Dog's Journey is a 2012 book written by W. Bruce Cameron and published by Forge Books.  It is the sequel to Cameron's 2010 book A Dog's Purpose.

Muffin Top: A Love Story: Muffin Top: A Love Story is a 2014 American romantic comedy directorial debut film directed by Cathryn Michon, who also starred in the film.  The film's script was written by Michon with her husband W. Bruce Cameron.  It is based on her 2004 novel "The Grrl Genius Guide to Sex (With Other People)", which was partially based on her life.  The film stars Michon as a woman who must re-enter the dating world after her husband (played by Diedrich Bader) leaves her for a younger woman.  It had its world debut on October 18, 2014 at the Carmel International Film Festival.  Distribution for the film was handled by the on-demand movie distribution website Tugg, which allowed Michon to show her film in areas with high enough demand.  "Muffin Top" was also released via VOD.

A Dog's Purpose: A Dog's Purpose is a 2010 novel written by American humorist W. Bruce Cameron, author of "8 Simple Rules for Dating my Teenage Daughter" and "How to Remodel a Man".  The book chronicles a dog's journey through several lives via reincarnation and how he looks for his purpose through each of his lives.

Nathan Cohen (critic): Samuel Nathan Cohen known as Nathan Cohen (16 April 1923 – 26 March 1971) was a Canadian theatre critic and broadcaster.  Cohen was considered the country's only serious drama critic during the decades following World War II, the period when Canadian theatre became established.  He was born in Sydney, Nova Scotia, to an Eastern European Jewish immigrant family.  He got his start in media when he was the editor of Mount Allison University's student newspaper.  After graduating from Mount Allison, he was the editor of the "Glace Bay Gazette".  He permanently moved to Toronto in 1945 and wrote for various Communist Party supported newspapers.  In 1948, he became the Theatre critic for CBC Radio.  When CBC began television broadcasts in the 1950s, Cohen became one of their first talk show hosts.  He joined "The Toronto Daily Star" in 1959, and worked as its theatre critic until his death in 1971.

Martha Allan: (Marguerite) Martha Allan (1895 – April 4, 1942) was the founder of the Montreal Repertory Theatre and co-founder of the Dominion Drama Festival.  She loathed amateur theatre, but her energies spearheaded the Canadian Little Theatre Movement at a time when live theatre in Montreal and across Canada was being threatened by the rapid expansion of the American-influenced movie theater.  She almost single-handedly laid the groundwork for the development of the professional modern Canadian theatre scene.  In 1935, she received the Canadian Drama Award for outstanding service in the development of the Canadian theatre.  At the annual Dominion Drama Festival the "Martha Allan Trophy" is awarded in her memory for the best visual performance.  She also wrote three plays: "What Fools We Mortals Be"; "Summer Solstice"; and "All Of A Summer's Day", that won the Sir Barry Jackson Trophy for the best Canadian play at the Dominion Drama Festival in the early 1930s.

Luke Kirby: Luke Farrell Kirby (born June 29, 1978) is a Canadian theatre, film, and television actor.

Benoît McGinnis: Benoît McGinnis is a Canadian theatre, film and television actor who was nominated for a Genie Award for Best Performance by an Actor in a Supporting Role for his role in "Le Banquet".  McGinnis has also appeared in other works including the hit TV series "Les hauts et les bas de Sophie Paquin" and the Canadian movie "Heartbeats (Les Amours imaginaires)".  He graduated from the National Theatre School of Canada in 2001.

A Dog's Purpose (film): A Dog's Purpose is a 2017 American comedy-drama film directed by Lasse Hallström and written by W. Bruce Cameron, Cathryn Michon, Audrey Wells, Maya Forbes and Wally Wolodarsky, based on the 2010 novel of the same name by Cameron.  The film stars Britt Robertson, KJ Apa, Juliet Rylance, John Ortiz, Kirby Howell-Baptiste, Peggy Lipton, Dennis Quaid and Josh Gad.

Rita Lafontaine: Rita Lafontaine {'1': ", '2': ", '3': ", '4': "} (8 June 1939 – 4 April 2016) was a Canadian theatre, film, and television actor.  Born in Trois-Rivières, Quebec.  She has been described as the muse of playwright Michel Tremblay and director André Brassard.  Her career spanned over fifty years and left an "indelible mark on Québec theatre, film and television".  She is a four-time recipient of the Gémeaux Award; three times for Best Lead Actress and once for Best Supporting Actress.  She was named an Officer of the Order of Canada in 2005 and an Officer of the National Order of Quebec in 2011.

Supporting paragraphs: W. Bruce Cameron Luke Kirby
Answer: Luke Kirby