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These parents are downstairs arguing about where the angel is that's supposed to go on top of the tree. Their young son, Liam, overhears them. He decides to write a letter to Santa. He comes downstairs and tells his parents about the letter and we get a lot of info - he's in the 6th grade so his dad is concerned he's still writing to Santa. They moved to this town 3 months ago but his parents are still surprised to find out he made a friend. For some reason, Liam lies and says Gibby has cancer. Needless to say, Liam is a bit awkard and we also find out that he has dyslexia.
The next day at school, he is captivated by his crush Emma who even stands up for him when kids make fun of his dyslexia.
After school, he goes to drop off his letter to santa but accidentally misspells "Santa" as "Satan". Next thing you know, Satan shows up in the middle of the night. Liam still believes he is Santa despite the fact that he doesn't look like Santa and he has devil horns. Satan figures out what happened and decides to play along and offers to grant Liam three wishes. Not sure what to wish for, Liam wishes that Emma would give him a chance.
At school, he notices that Emma is really staring at him. Satan appears in a mini version and tells him to go shoot his shot. He invites her to the Post Malone concert and she is very excited.
Liam tells Gibby about his encounter with "Santa". Gribby is like it has to be a mistake. So Liam confronts Santa and figures out he's Satan and tries to get out of the deal. Satan says that when he makes his final two wishes, which he guarentees Liam will make, then Liam's soul belongs to him.
Liam gets home and is greeted by his parents and a child psychologist. His session is interrupted by Gibby and Satan, who take Liam to the concert. With a little help from Satan, Liam is called onto the stage by Post Malone who calls Liam his inspiration. He dances and brings Emma on stage. Afterwards, she kisses him on the cheek! Everything is going great except Gibby is starting to feel a little left out.
Later at home, Liam uses his second wish to fix Gibby's teeth and invites Gibby to join his date with Emma at the local Christmas carnival. His parents become incredibly concerned when they overhear the conversation about Satan. So they go and pick him up at the carnival and bring him to the good doctors clinic. Satan tries to make Liam use up his third wish by showing him images of Gibby and Emma apparently enjoying the carnival without him but he's not falling for it. His parents then see a video of Liam at the Post Malone concert and they realize that he wasn't lying to them afterall.
Liam locks himself in his room and facetimes Gibby and yells at him for hanging out with Emma and tells him that he's the one who fixed his teeth.
Liam then overhears his parents aguing about the death of his brother Spencer. Liam, fearing that his parents are going to call it quits, goes to the hotel that Satan is staying at and wishes that his parents would stay together and be happy. It immediately works and his parents have a real heart to heart.
But now knowing that he's going to hell, Liam decides to give into bad. He's ruthlessly mean to everyone. Emma tells him he's being a jerk and he begins to feel bad.
Meanwhile, in Hell, we find out that Satan is in fact not Satan, but just a low level demon, who has failed his trial to become a full demon: by granting two unselfish wishes, he has rendered the deal for Liam's soul invalid and is banished from hell forever.
Satan visits Liam and tells him about the deal's cancellation, and Liam figures out that he is not the real Satan. Before leaving, Satan confesses how much he has come to like him and explains that the third wish was negated because Bill and Molly made up on their own, so he used the contents of Liam's original letter to fulfill a third and final wish. Now wanting to use his powers to help others, Satan takes the form of an angelic dove and flies away.