The Monster Squad (1987) on Netflix

One hundred years ago, Dracula and other monsters survive to the attack of Dr. Van Helsing and his men to his castle with a magical amulet. In the present days, Dracula travels to the United States and arrives in a small town. He summons the Werewolf, the Mummy, the Swamp Thing and Frankenstein's creature to help him to retrieve the amulet. In the town, a man claims that he is the werewolf and goes to the police station to ask to be locked up in a cell. Meanwhile a mummy vanishes from the local museum and police detective Del is assigned to investigate the case. When his son Sean, who is a monster fan, learns the news, he joins his friends Patrick, Horace and Rudy in his monster club to read a Van Helsing's journal that was given by his mother. However the book is written in German and they are not able to translate it. So they asks for help from their weird neighbor that they call Scary German Guy and they discover that they need to recover the amulet and a virgin to get rid off Dracula and the monsters. Meanwhile Sean's little sister Phoebe, who is unsuccessfully trying to join the club, befriends Frankenstein's creature. The unlike group brings Patrick's sister, who claims that is virgin, to read the passage that sends the monsters to the limbo. Will they be successful in their intent?