Question: Verity Marshall played the role of Amy during the Christmas episode of what TV show?

Context paragraphs:
Bill Marshall (baseball): William Henry Marshall (February 14, 1911 – May 5, 1977) was an American professional baseball second baseman.  He batted and threw right-handed.  Marshall played seven games in Major League Baseball: one for the Boston Red Sox in 1931 and six for the Cincinnati Reds in 1934.  In 1931, he was the fourth youngest player in the American League.  After retiring as a player, Marshall scouted for the Boston and Milwaukee Braves, the San Francisco Giants, and the Seattle Pilots.

Ben Marshall (rugby player): Ben Marshall (born 8 June 1990) is a retired rugby union player from Ireland.  He primarily played as a lock or in the back row.  Marshall played for Irish provincial sides Leinster and Connacht in the Pro12, but was forced to retire in 2017 due to a concussion injury.

The Christmas Story (The Andy Griffith Show): "The Christmas Story" is an episode from the American television program "The Andy Griffith Show" broadcast Monday December 19, 1960 on CBS.  A family spends Christmas Eve in jail.  "Christmas Story" is the eleventh episode in season one, and the eleventh episode in the complete series.  The show is noted for being the only Christmas episode in "The Andy Griffith Show" complete series, and for featuring actress Margaret Kerry, the model for Tinkerbell in Walt Disney's 1953 animated feature film, "Peter Pan".  On December 25th, 2015, CBS aired this episode in color, as part of "The Andy Griffith Show Christmas Special", which also included "The Pickle Story".

White Christmas (Black Mirror): "White Christmas" is a 2014 Christmas special episode of the British science fiction anthology series "Black Mirror".  It was written by series creator and showrunner Charlie Brooker and directed by Carl Tibbetts, and first aired on Channel 4 on 16 December 2014.  The only television special of the series, it is also the last episode to be aired on Channel 4, as the series would move to Netflix for its third series.

Gordon Marshall (footballer, born 1964): Gordon Marshall (born 19 April 1964) is a Scottish former professional footballer, who played as a goalkeeper for several clubs, most notably Falkirk, Celtic, Kilmarnock and Motherwell.  Marshall played in one international match for Scotland, in 1992.  He is currently the goalkeeping coach at Aberdeen.

Jack Marshall (ice hockey): John Calder "Jack" Marshall (March 14, 1877 – August 7, 1965) was a Canadian professional ice hockey player.  Marshall played for the Winnipeg Victorias, Montreal HC, Montreal Shamrocks, Montreal Wanderers, Toronto Pros and Toronto Blueshirts.  Marshall was a member of six Stanley Cup championship teams for four clubs.  He won his first Stanley Cup in 1901 with Winnipeg Victorias.  He then joined the Montreal HC and won two more Cups in 1902 and 1903.  He also won the Stanley Cup with Montreal Wanderers in 1907 and 1910.  Marshall won his sixth and final Cup as a player-manager with the Toronto Blueshirts in 1914.

John Marshall (Third Lanark footballer): John Marshall was a Scottish footballer, who played for Third Lanark, Wellpark, Harmonic and Scotland.  Marshall played four times for Scotland and scored one goal, in an 8–2 win against Ireland in 1885.  He later became a football referee.

Darius Marshall: Darius Marshall (born February 21, 1989) is a former American football running back.  He was a member of the New Mexico Stars.  Marshall played college football for the Marshall Thundering Herd.

Verity Marshall: Verity Marina Marshall is an English actress best known for her role as Amy in the "White Christmas" episode of the series, "Black Mirror", starring Jon Hamm and Rafe Spall.

White Christmas Blues: "White Christmas Blues" is the eighth episode of the 25th season of the American animated sitcom "The Simpsons", and the 538th episode of the series.  It originally aired on the Fox network in the United States on December 15, 2013.  The episode was written by Don Payne and directed by Steven Dean Moore.  It was the first Christmas episode since "Holidays of Future Passed" and the twelfth Christmas episode of the show.

Supporting paragraphs: Verity Marshall White Christmas (Black Mirror)
Answer: Black Mirror