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Jackson, unbeknownst to anyone else, is outside trying to talk himself into joining the party. When he's finally ready, however, the doors of the De Nile residence swing open and the loud music gets to him. Minutes later, Jackson still is nowhere to be seen, but the party is livened up by the arrival of a DJ by the name of Holt Hyde. He openly flirts with Frankie, who enjoys the attention greatly after feeling stood up. Meanwhile, Clawd finds Draculaura and promises he'll improve his table manners for her. Draculaura merely laughs and explains that that isn't what she wants from him - the problem is that the pizzas had garlic topping on them. All he has to do is brush his teeth and they can dance.
Also the party was DJ-ed by Holt Hyde. The ghouls then tease Frankie a little about her crush on Holt. Draculaura notices that Jackson is at the Maul and the ghouls urge Frankie to "shock some sense into him" about standing her up at Cleo's party. Jackson tells Frankie that he remembered he was going to the party and he was outside and got nervous because Frankie was there and then he blacked out. Frankie then tells about the party and about Holt and asks if he knew him which he says no (and Heath gets super hyper about it). Jackson then asks Frankie for another chance and asks her out on a date to a silent movie at the Revival House. She says yes and the ghouls plan to accompany her on her 1st ever date. At the movie, everyone else besides Frankie and Jackson are bored out of their minds. Clawd then decides to play some music which everyone dances to. Jackson is seen shivering and apologizes to Frankie then leaves. Frankie is hurt once again to be stood up by him again. Draculaura then tells her "what do you expect from a normie" and Frankie says that she thought Jackson was different. Holt then comes in and sits next to Frankie and flirts with her. Frankie, not in the mood, tells him that she's on a date to which he replies with himself. Frankie then leaves and is outside looking for Jackson. Holt is seen getting kicked out the theater and steps into a puddle saying "Not cool!". Holt then transforms back into Jackson and he sees Frankie looking for him. He hides behind the dumpster questioning what is happening to him.
Frankie notices Jackson in the hallway, but she is blown off yet again, leaving her confused and slightly hurt. Then Toralei shows her a text from the Ghostly Gossip stating that she was dating two boys at once (Jackson and Holt), and that there was the possibility of a third. This leads her to accuse Draculaura as being the Ghostly Gossip, which turns into a fight between the ghouls until Lagoona shows up and tells them that the Ghostly Gossip is the one tearing them apart.
Frankie meets Holt outside the school. Frankie is initially put off by his attitude, but Holt quickly apologizes for being too forward when the first met. They start to talk and begin to find common ground. Then when Holt starts to flirt with Frankie, it cheers her up after feeling down about Jackson.
Frankie Stein goes on a date with Holt Hyde and in the end finds he's more than meets the eye. Draculaura thinks Frankie Stein has a crush, but Frankie Stein denies it. Jackson Jekyll then shows up, who had been clear from her mind during all of this, and she is surprised that she forgot all about him and the fact that she was crushing on to two boys. Before she can dwell on this, Clawdeen Wolf shows up hyped about two zombie boys, Slo Mo and Don of the Dead fighting over Ghoulia Yelps. Frankie Stein soon realizes that the same thing might happen between Holt Hyde and Jackson Jekyll over her.
After consulting Teen Scream, she gets the advice to ask her friends, which turns disastrous. Lagoona Blue breaks out in tears over Gil; Clawdeen Wolf and Draculaura completely ignore her while favoring a conversation about when Clawd Wolf can go out with Draculaura, and Cleo de Nile is too preoccupied spying on Deuce Gorgon and Operetta, in which she finds "evidence" that Deuce Gorgon was legitimately cheating on her.
After this, Frankie Stein realizes just how complicated romantic relationships are, and realizing that dealing with just one boy is hard enough she decides that she has to make a choice: Holt Hyde or Jackson Jekyll.
After a good time with Holt in the last webisode, Frankie tries to convince herself to break up with Jackson, but then she sees him in the hallway and is reminded of the fun she had with him. Frankie's imagination runs wild when she creates to smaller versions of the boys she likes, who fight over her love. Before going to the restroom, Frankie said that she needs to clear her mind.
Frankie and Jackson walk into the same hallway Cleo was in, but then after hearing the music, Jackson transforms into Holt, and Frankie was shocked with what she saw.
As Jackson wakes up, confused yet again, Frankie shows him a video of Holt, revealing to him that they are the same person. Jackson gets really fired up, saying that Holt is everything that he hates and that he can't even confront him about it. This prompts to Frankie come up with a way that he can talk with Holt: She will act as a messenger between the two. But she doesn't realize just how much they have to say to each other. After listening to them bicker for a while, Frankie decides that she can't choose one over the other, reasoning that they are the same person deep inside. She hands them an their iCoffin to continue the conversation without her, opting to take a break until they can sort things out.
At school, something has everyone talking and Frankie shows Jackson that someone vandalized the school with red paint. Jackson takes his paint-stained hands out of his pockets and explains that Holt must have done it. The two conclude that if Headless Headmistress Bloodgood finds out about this, Holt will be expelled and therefore Jackson too. And even aside from that, Frankie refuses to believe that Holt would just go and vandalize Monster High. They agree to uncover the truth of what happened, which is a mission not made any easier by the need to avoid Bloodgood at all cost. As it turns out, none of their fellow students have seen a thing, but the custodian, Mr. Ogrethor, has. He confirms that Holt was carrying paint out of the back of the school last night.
Jackson and Frankie Stein retreat back to the vandalized wall, wondering what they should do now that they have confirmation that Holt is fully responsible. Headless Headmistress Bloodgood shows up as they talk and tells Jackson she has to speak with him about Holt. Out of ideas, Jackson readies himself to accept the consequences of his counterpart's actions. However, it turns out that Holt was commissioned to paint a mural on the wall, but had to stop when Ogrethor, who can't stand loud noise, turned off his music, thus changing Holt back to Jackson. Bloodgood turns on a stereo to turn Jackson into Holt again so the latter can finish the mural, which ends up being a painting of Nightmare.
All the guys and ghouls of Monster high are frightfully ready for a night of celebration, everybody seems to have a plan for the new year.
The students count down from three and all shout Happy boo year! Heath salutes and promptly falls over as Spectra catches a picture of him falling.
The students are initially skeptical about their need to be there for the tree, until Venus reminds them that the tree symbolizes their history. Spectra remembers the great stories she wrote under the tree, Manny notes he lost five soccer balls to the tree's branches, Ghoulia thinks back on all the times she studied under the tree, and Draculaura and Clawd recall how the tree was part of their first date. As the students share their individual experiences with the tree, his roots plunge back into the soil and leaves sprout from his branches. With no doubt that the tree has been revitalized, the students celebrate.
A party is held at Monster High and Frankie helps out with catering, creating and distributing smoothies to her fellow students and the teachers present.
Before long, everyone is dancing to Holt Hyde's music. With no one to serve anymore, Frankie cleans up, happy with the energy her smoothies injected into the party.
As each year prior to Halloween, the students of Monster High are shown a video to warn them of the dangers they might face up until after the holiday. Halloween traditionally is the day that the humans come out to hunt for monsters, and even if few humans still practice the holiday like that, monsters still can't consider themselves safe days prior to and on Halloween itself. Most of the students are familiar with the video and more so that no Halloween attack has happened within their lifetime. Therefore, all are unimpressed and uninterested, except Frankie, who's about to experience her first Halloween ever. Having first read about the holiday in magazines, she is utterly shocked that Halloween isn't about candy and fun.
Abbey learns from Lagoona that what is bothering Heath is that his male ego got hurt because he needed a girl's help, which Abbey finds stupid. The two meet up with Frankie and Deuce in the hallway and witness a number of students giving each other strange signals. Thanks to Heath's idiocy, they learn that there's a meeting in the courtyard later where the students will discuss their plans to get back at the humans. The four decide to spy on the event and learn that Cleo is the instigator. After her speech and Jackson's transformation to Holt (as Jackson, being a human, isn't allowed to partake in the revenge), the group goes into the catacombs to get to New Salem High to vandalize it like what had been done to Monster High. Frankie and her friends follow them. On the way, Holt runs off in front of the group, thinking they are too slow. When finally the group reaches New Salem High, they find a huge Skullette drawn onto the school's front side. As they are wondering what to do to top that kind of vandalism, the New Salem Police arrive to investigate the damage. The students run and, as per the Halloween Warning video's advice, hide themselves in a variety of clever ways.
Eventually, everyone makes their way in front of a certain house, where they discuss whether Holt could be responsible for the graffiti and how to get back to the catacombs.
Holt is taken to the police station and thrown in a cell. The New Salem Sheriff demands that he hand over his headphones, which Holt does. He promptly changes back to Jackson, but due to sheer luck, the Sheriff is looking the other way when that happens and doesn't notice the change at all until the next morning. By then, Jackson's had enough time to concoct a story that Holt escaped, abducted him, and locked him up in the cell instead. The Sheriff believes him and even gets him a ride 'back' to New Salem High. Jackson is at first wary of his new environment, thinking everyone is ready to attack him for being a monster, as he is used to being a target for being human at Monster High, until he realizes that no one at New Salem High knows about his monster side. Everyone thinks he's just another human, causing an unusual sense of feeling welcome in Jackson. That is, until the goons attempt to beat him up, but Jackson finds himself saved by Clair.
Shortly after, New Salem High gets vandalized a second time, and both the humans and monsters think it's Holt again. The humans call for his arrest, while the monsters generally are impressed with and proud about Holt's accomplishments. Hearing her father's and sister's voices in her head still, Cleo lies to her fellow students that Holt sent her an email confirming he is responsible for the attacks on New Salem High and that he will keep in contact until his return with Cleo only because she was the one to inspire him, which makes Cleo a figure of unquestioned authority in the eyes of most of her peers. She does tell her audience that Holt will keep them up to date through his Critter account. Frankie, Deuce, Abbey, and Lagoona don't know what to think of the mess, but they do know they need to stop Holt before things get out of hand even more. With Ghoulia's help, they find out that Holt is somewhere inside New Salem High and they go out to get him that night. Coincidentally though, right that night, Lilith and her goons are working to vandalize their own school again, this time in costume and with a camera ready to film the act as fake evidence that monsters were behind the vandalism. Lilith immediately spots the four monsters trying to get into New Salem High and gets the police. Frankie and co. find Jackson hidden away in a closet, but the reunion is cut short when Lilith and the police arrive, force Jackson to transform into Holt, and arrest him. The other four are free to return to Monster High, where they're again put in detention. Worse, during their talk with Bloodgood, the headmistress receives a phone call to turn on the TV. The Sheriff holds an announcement that he will return the true meaning of Halloween by condemning Holt to the Trick-or-Treatment, a death sentence not used in two hundred years. Bloodgood is further informed by the Monster Elder Council that no action will be or may be taken to save Holt.
At detention, Frankie comes up with the idea to get help from Chad and Clair, who can look for evidence that Holt has been framed. Her friends help her escape and she manages to contact Chad and Clair, who are eager to get Holt's innocence proven.
Then Frankie and co. make their presence known and demand that Lilith and Cleo confess what they did to the Sheriff. Lilith and Cleo put up no resistance and explain everything to him, but the Sheriff reveals that he couldn't care less. He needs to show he's a capable lawman and by keeping Holt the perpetrator and punishing him by execution, he'll accomplish just that.
Frankie and co. go to work on a new plan. Just freeing Holt will only have the humans come and get him, so more has to be done. The team decides that, on one hand, they'll free Holt and, on the other, bait the humans to the Hall of Halloween, where they can learn the true history of humans and monsters. Lilith gets her goons to help in this endeavor. The goons dress up as monsters and pretend to attack Chad, Clair, and Lilith when Holt is put in the Trick-or-Treatment machine, which forces the police away from the device to arrest the monsters. Frankie and Abbey use the diversion to free Holt and then make a run for it, in which they are also assisted by Robecca. As the police figure out they've been duped and give chase to the real monsters, even pursuing Robecca in their cruisers, Chad and the goons rouse the human crowd to take matters into their own hands and attack Monster High.
Frankie and Holt reach the Hall of Halloween well in time to prepare for the humans' arrival. When they enter, the monsters greet them as the guests of their party, which confuses the humans greatly. Lilith comes forth to confess she is behind the vandalism that plagued New Salem and that though she meant to protect the humans, she now knows she has nothing to fear from the monsters. The humans accept the confession and invitation, but then the Sheriff and his officers finally arrive, intending to arrest Holt, Frankie, and all monsters present. The New Salem students, however, make a stand against the Sheriff and challenge him to arrest them as well if they want to get to the Monster High students. The Sheriff, wanting to avoid the fallout if he arrests the New Salem students as well, saves face by claiming it's past midnight and that means he is off duty anyway, before sneaking off to the snacks. With all conflict thus ended and subdued, the party commences.
At the DJ stand, Holt tries to flirt with Clair, but she takes of his headphones because she's more interested in Jackson. Clair kisses Jackson causing him to faint.
- In the cartoon series, he has a habit of screaming his words in like a heavy metal musician.
- In the webisodes, Holt's transformation is green, and resembles light, but in the CGI specials, it is a fiery orange red, resembling fire.