After the eventful holiday in Hotel Transylvania 3: Summer Vacation (2018), Count Dracula has a little announcement to make. However, as ecstatic Johnny starts meddling with Van Helsing's mysterious contraptions, all hell breaks loose, and suddenly, a new tenant sets foot in the ancient monster resort. Now, the Prince of Darkness isn't feeling himself, and his son-in-law, too, is someone else. As friends and family do their best to avert the inevitable, a frenzied journey to the corner of the Earth begins. Can Mavis and her monstrous dream team right a wrong and stop the transformation that ruins everything?