Douglas Pipes is a film music composer whose feature films include the Academy Award nominated "Monster House" and the horror film "Trick 'r Treat".
 His brassy instrumentations have drawn comparisons to action-music composer guru Alan Silvestri and his other orchestral-music composer counterparts Michael Giacchino, J.A.C. Redford and Joel McNeely.
 His chance encounter with Gil Kenan at UCLA California made him the perfect composer for this soundtrack and composed the music on his short film "The Lark".
Mistresses is an American mystery drama and soap opera television series based on the 2008–10 U.K. series of the same name, about the lives of four female friends and their involvement in an array of illicit and complex relationships.
 This adaptation was developed by K.J. Steinberg, and stars Alyssa Milano, Rochelle Aytes, Yunjin Kim, Jes Macallan, Jennifer Esposito and Tabrett Bethell in the lead roles.
 The series was originally set to premiere on May 27, 2013.
 However, ABC announced that "Mistresses" would premiere on June 3, 2013.
Sam is a fictional character created by Michael Dougherty, appearing first in Dougherty's 1996 animated short film "Season's Greetings", and the main antagonist in the 2007 anthology horror film "Trick 'r Treat".
 He was played by child actor Quinn Lord in the film.
 Appearing as a seemingly innocent masked trick-or-treater, Sam is revealed to be a demonic pumpkin-like creature who acts as the enforcer for the rules and traditions of Halloween.
The fourth and final season of the American television drama series "Mistresses" premiered on May 30, 2016, on ABC.
 The series is based on the UK series of the same name and was adapted by K.J. Steinberg, it stars Yunjin Kim, Rochelle Aytes, Jes Macallan and Tabrett Bethell as the four lead characters.
Trick 'r Treat is a 2007 American-Canadian anthology horror film written and directed by Michael Dougherty.
 The film stars Dylan Baker, Brian Cox, Rochelle Aytes, Lauren Lee Smith, Leslie Bibb, and Anna Paquin.
 It centers on four Halloween-related horror stories.
 One common element that ties the stories together is the presence of Sam, a mysterious child trick-or-treater wearing shabby orange footie pajamas with a burlap sack over his head, who makes an appearance in all the stories whenever someone breaks Halloween traditions.
The second season of the American television drama series "Mistresses" premiered on June 2, 2014, on ABC.
 The series is based on the U.K. series of the same name and was adapted by K.J. Steinberg, it stars Alyssa Milano before she left the series, Jes Macallan, Rochelle Aytes and Yunjin Kim as the four lead characters.
Quinn Edmond Julian Lord (born February 19, 1999) is a Canadian teen actor.
 Beginning his professional acting career at the age of five, Lord played Sam in the 2007 feature film "Trick 'r Treat" and was nominated for the Young Artist Award as Best Leading Young Actor in a Feature Film for his role as Thomas Whitman in the 2012 feature film "Imaginaerum".
 He currently has a recurring role on Amazon's TV series "The Man in the High Castle".
Michael Dougherty is an American film director, producer, and screenwriter, known for his work with Dan Harris on the scripts for Bryan Singer's films "X2" and "Superman Returns".
 He's also known for writing and directing the cult horror film "Trick 'r Treat".
 On October 28, 2013, at a special screening, it was announced to the surprise of the audience that a sequel will be produced by Legendary Pictures.
 He also directed, co-wrote, and co-produced the horror/comedy "Krampus" (2015).
 Dougherty will be co-writing and directing the upcoming sequel "" for a March 22, 2019 release date.
Trick 'r Treat: Days of the Dead is a horror anthology comic book set within the "Trick 'r Treat" franchise, written by Michael Dougherty, Todd Casey, Zach Shields and Marc Andreyko and published by Legendary Comics.
Rochelle Aytes (born May 17, 1976) is an American actress and model.
 She is best known for her role as April Malloy on ABC drama series "Mistresses" (2013-16).
 Aytes also starred in the auto-biography story film of TLC such as "" as Perri "Pebbles" Reid, short-lived series "Drive", "The Forgotten" (2009–10) and "Work It".
 In film, Aytes has appeared in "White Chicks", "Madea's Family Reunion" and "Trick 'r Treat".

Question: What country of origin does Rochelle Aytes and Trick 'r Treat have in common?
Answer: American