Dennis (possibly Dennis Dracula or Dennis Loughran or some combination of his parents' surnames) is the half-human/half-vampire son of Jonathan Loughran and Mavis Dracula. He is also the grandson of Dracula and Martha (his maternal grandparents) as well as Mike and Linda (his paternal grandparents). Through Mavis, Dennis is also the great-grandson of Vlad Dracula (his mother's paternal grandfather). While born showing no vampire traits, by his fifth birthday, he finally grew his fangs and likewise manifested his vampire abilities. He first appeared in Hotel Transylvania 2 as the main protagonist and in Hotel Transylvania 3: Summer Vacation. He is likely to appear in the fourth film, Hotel Transylvania: Transformania.