When the hotel is unexpectedly visited by an ordinary 21-year-old traveler named Jonathan , Dracula must protect Mavis from falling in love with him before the hotel 's guests learn there is a human in the castle , which may jeopardize the hotel 's future .
When Hotel Transylvania is unexpectedly visited by a human traveler named Jonathan ( voiced by Andy Samberg ) , Dracula must protect and rescue Mavis from falling in love with him before it 's too late .