In a peculiar castle on a remote island, the reclusive and eccentric scientist Dr. Frankenstein decides to throw a very special party. When his loyal assistant, Francesca, reminds him that it’s the monster's birthday, Dr. Frankenstein summons a unique guest list: the most legendary monsters from literature and film! Vampires, werewolves, mummies, and classic monsters all arrive at the event, ready to celebrate on a night full of fun and surprises.
However, the festive atmosphere turns tense when Dr. Frankenstein reveals his intentions to unveil his newest creation: a brilliant experiment that could change the fate of all monsters. As the guests enjoy the party with music, dancing, and mischievous extras, the situation complicates when disaster looms over the event. Some of the monsters have hidden motives and start having bad ideas that could ruin the evening.
Amid the confusion, Dr. Frankenstein and Francesca must fight not only to keep the party afloat but also to ensure the safety of all attendees and, of course, to prevent the Doctor's creation from falling into the wrong hands. Rich in humor, catchy music, and the typical aesthetic of classic monster movies, this film is a celebration of the Halloween spirit and the camaraderie among the strangest beings cinema has ever seen.