His sister Jenna comes home from college for Halloween, but things turn sour when Dougie finds out she brought her boyfriend, Alex, with her.

After a fall out with Jenna, Dougie wanders off and finds a man dressed in a cheap costume arranging a dead body on his lawn as if it were a decoration.

On the way home, Satan engages in a combination of assaulting and killing several more people, including Alex's estranged dad, before he and Dougie are accosted by the police.

Variety called the film "Madly uneven", but wrote that it "delivers more than its share of exquisite creepy/funny bits but ultimately rests too much on the chubby little shoulders of a 9-year old.

"[1] The website JoBlo.com gave the film an 8/10 rating, writing, "if you like your horror with a heaping dose of the blackest of black comedy, then Satan’s Little Helper will be quite the treat!

"[2] Dread Central called the film "Irreverent, subversive and deliciously caustic [...] a unique and daring achievement", describing it as "a satiric commentary on the influence of videogames and fiction, the distinction between fantasy and reality for a child, and the danger and power of Halloween – all in a movie filled with blood, guts and black humour.