Draculaura, Frankie, Clawdeen, Cleo and Lagoona travel to a Transylvanian castle to find a lost vampire princess and bring her back to Monster High.
Draculaura, Frankie, Clawdeen and Lagoona search a tropical island for a fabled monster, Gil, but before completing the mission, the volcano in the middle of the island begins to erupt; Cleo helps a resistant Dracula integrate into the 21st century.
In an effort to save Gil's island, the ghouls travel to an icy mountain range and split into two groups to find a ghoul with ice powers that can stop the imminent volcanic eruption.
Gob runs away from Monster High and the Ghoul Squad discovers him running wild in a department store for humans; the ghouls must work together to get him back to Monster High before the store reopens.
Toralei complicates the Ghoul Squad's latest mission to find a hidden monster deep inside some ancient catacombs when she tries to take an artifact that triggers an avalanche of the ancient cave's traps and defenses.
Monster High has a leaky roof problem, so the Ghoul Squad travels to Paris to recruit Rochelle, a gargoyle, to help, but Rochelle can't leave until the ghouls help her deal with a troublesome, roof-destroying gargoyle named Rockspierre.
A hiccup with the Monster Mapalogue causes fuzzy little monsters from a popular new game to come to life in Monster High; the ghouls must upgrade their iCoffins to suck the monsters back into the video game before they destroy the school.
When the Ghoul Squad tracks down Catty Noir in an old abandoned theater, they discover she has lost her confidence to go back on stage; to help Catty get over her stage fright, they encourage her to perform in the upcoming Monster High talent show.
In an effort to go on a beach vacation, Toralei steals the Monster Mapalogue, but breaks it, accidentally teleporting herself, Cleo and Lagoona to a faraway desert location.
The Ghoul Squad receives a call for help from Treesa Thrornwillow, whose sister plots to destroy the Haunted Garden where they both live; the ghouls must take flight with new butterfly wings to stop Tressa's sister and save the garden.
The Ghoul Squad attempts to create a holiday for monsters.
Frankie creates her own little sister, Alivia Stein.