After the witches see Calista try to be scary with her Giggling Goblin giggle, Lucinda asks Sofia if they should tell Calista if her Giggling Goblin giggle is more cute than scary. Determined to keep anything else from being ruined, Calista, despite protests from Sofia and the witches, drives the ghosts away with dirty socks and a bright light. Sofia dismisses it as it will make her nervous. Hearing this, they agree to let her come. When the other witches arrive, Calista offers to lead them through the maze. The group then steps up for the Haunted Hay Ride where they meet. When Calista assures she will be handy when it comes to the scaring, the witches ask her if she knows how Trick or Treating works.
Sofia and Calista climb on Lucinda and Lily's brooms respectfully and the group sets off for their first stop. However, she leads them to a dead end. Sofia tells her she does not have to prove anything and just needs to be herself. Sofia tells Indigo to undo her hex and bring Calista back, but she refuses. The group lands at Dragonhold to get candy from.
Indigo thinks she is too little to come with them, which Calista protests to. She states that Calista was ruining Halloween to which Lily agrees. Calista states she will not get scared and can walk just as fast as them. P since he is famous for handing out the best candy. Calista tells her she needs to show her witch friends that she is not some silly kid who messes things up. She also adds that she knows a lot about Halloween, which Sofia confirms by telling them about how Calista reads the Ghastly Guide to Halloween every night.
However, Calista proves to be too cute to spook Merlin and gets a trick: Tremendously Tart Lemon Sours, Lemon candies that are so sour, they turn one's face yellow and make one's mouth swell up, which Calista discovers the hard way after she eats one to hide from the witches she got a trick. Unfortunately, driving the ghosts away causes the carriage to go out of control and crash in the Dreary Woods. Calista notes to Sofia that her friends are scared, to which Sofia assures her it is the fun scared. Sofia reminds her witch friends that there is still the Corn Maze Dash for Gummi Ghouls at Lucinda's house so, after Calista puts her Giggling Goblin costume back on, they fly off. After the Goblin takes the witches' wands, Sofia encourages her to execute her plan. This time Calista is able to make a good enough scare by putting herself in a dragon costume that spouts out real fire and gets the same treat as the others: Pumpkin Pops which glow. Sofia urges her to let someone else lead but Calista insists that she must get the girls their treats.
Calista has an idea, but is not sure if she should execute it. Suddenly, the group gets attacked by the Giggling Goblin. Calista confirms she does: If you do a good enough scare, you get a treat but if you fail to give a scary enough scare you get a trick. With the Goblin's help, they get more candy from Mr P. Afterwards, the witches reconcile with Calista and tell her that she made this the best Halloween ever. Good and fed up, the witches all yell at Calista for ruining everything, stating this Halloween has been a big bust thanks to her. Ghosts appear to scare the group.
Indigo asks Calista if she has had enough Halloween, but she insists that she wants to do a lot more. The Jack O'Lanterns at each house measure how well you did. They are heading for a party hosted by Cordelia's friend Muldo the Magnificent. They also tell her they are friends and can join them for Trick or Treating next year. Unfortunately, Calista accidentally roasts the Pops when her excitement makes her costume unleash fire by mistake, to the annoyance of the witches. Sofia compliments Calista's costume, who says she is the of Dreary Woods, a goblin whose laughs cast magic spells that he mostly uses to steal candy, which is his favorite food.
Sofia urges her witch friends to give Calista one more chance and Indigo reluctantly brings her back. Calista is looking forward to doing everything with Sofia and her friends and hopes Sofia's witch friends will like her. Calista executes her plan: Giving the Goblin the Lemon Sours and retrieve the witches' wands and brooms. . Unfortunately, she just leads them right back to where they started and the other witches get the Gummi Ghouls. Sofia and Calista arrive in Dunwiddie Village and meet up with , dressed as a ghost, , dressed as a cat, and , dressed as a ghoul.
Sofia and the witches all sufficiently scare Merlin and get bat treats. After Cordelia says yes, the two girls set out together in the Royal Coach. As soon as they see Calista and Sofia explains why she is here, the witches instantly have misgivings about Calista coming along with them. Calista declares Halloween to be her favorite holiday, to which Cordelia concurs that Calista makes her read the Ghastly Guide to Halloween to her every night before bed. When Indigo and Lily express doubt, Calista tells them she wants to make up for destroying their Pumpking Pops, assuring them she knows the way from reading the chapter on Corn Mazes sixteen times.