It's a Plastic Pumpkin, Louis Huang - S4.E4

On Halloween, Louis is disappointed that Evan doesn’t take his childish delight in the holiday; Eddie and the gang plot to crash a cool older girl’s party; Jessica and Emery are spooked when they hear a strange man’s voice emanating from Grandma’s room, and things get even creepier when a mysterious group of costumed strangers whisk Grandma away, making them suspect the supernatural worst