Question: Which cult horror film, directed by Michael Dougherty, centers around four Halloween-related horror stories?

Context articles: Trick 'r Treat: Days of the Dead
Michael Dougherty
Campfire Tales
Karl Edward Wagner
Sam (Trick 'r Treat)
The Hillz
I Drink Your Blood
Godzilla: King of the Monsters (2019 film)
Trick 'r Treat
Krampus (film)

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.
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.
Campfire Tales (1991) is an anthology horror film written and directed by William Cooke and Paul Talbot.
 The film is about a group of teenagers telling ghost stories around a campfire.
 One of the storytellers is horror legend Gunnar Hansen.
 The movie also uses many elements from famous horror stories and directors (Lucio Fulci specifically).
Karl Edward Wagner (12 December 1945 – 14 October 1994) was an American writer, poet, editor and publisher of horror, science fiction, and heroic fantasy, who was born in Knoxville, Tennessee and originally trained as a psychiatrist.
 He wrote numerous dark fantasy and horror stories.
 As an editor, he created a three-volume set of Robert E. Howard's Conan the Barbarian fiction restored to its original form as written, and edited the long-running and genre-defining "The Year's Best Horror Stories" series for DAW Books.
 His Carcosa publishing company issued four volumes of the best stories by some of the major authors of the so-called Golden Age pulp magazines.
 He is possibly best known for his creation of a series of stories featuring the character Kane, the Mystic Swordsman.
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 Hillz is a 2004 film written and directed by Saran Barnun and starring Rene Heger, Jesse Woodrow, and Paris Hilton.
 It centers around four kids from Beverly Hills who form a ruthless gang.
 The entire film features Steve's (Woodrow) feeble attempts to obtain Heather Smith (Hilton) as his girlfriend, and a ruthless rebel child with some clear psychological disorders named Duff and his friend T trying to earn respect in their gang.
I Drink Your Blood (also known as "Hydro-Phobia") is a cult horror film originally released in 1970.
 The film was written and directed by David E. Durston, produced by Jerry Gross, and starred Bhaskar Roy Chowdhury and Lynn Lowry.
 The film centers on a small town, overrun by rabies infected members of a satanic cult after a revenge plot goes wrong.
Godzilla: King of the Monsters is an upcoming American monster film directed by Michael Dougherty and written by Dougherty, Zach Shields, and Max Borenstein.
 It is the sequel to 2014's "Godzilla" and will be the 33rd film in the "Godzilla" franchise, the third film in Legendary's MonsterVerse, and the third "Godzilla" film to be completely produced by a Hollywood studio.
 Despite the film's title, it is unrelated to the 1956 film of the same name.
 The film stars Vera Farmiga, Ken Watanabe, Sally Hawkins, Kyle Chandler, Millie Bobby Brown, Bradley Whitford, Thomas Middleditch, Charles Dance, O'Shea Jackson Jr., Aisha Hinds and Zhang Ziyi, and is scheduled to be released on March 22, 2019 in 2D, 3D, and select IMAX, except in Japan where it will be distributed by Toho.
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.
Krampus is a 2015 American comedy horror film based on the eponymous character from Austro-Bavarian folklore, directed by Michael Dougherty and written by Dougherty, Todd Casey, and Zach Shields.
 The film stars Adam Scott, Toni Collette, David Koechner, Allison Tolman, Conchata Ferrell, Emjay Anthony, Stefania LaVie Owen, and Krista Stadler.
 It was released in the United States on December 4, 2015, by Universal Pictures.