A Really Haunted Loud House follows Lincoln Loud and his best friend Clyde as they decide between going trick or treating and being part of the signature Loud family Spooktacular or attending a party hosted by Xander, the new cool kid at school.

With Clyde finally back from camp, Lincoln has the entire day planned for maximum fun for their last day of summer. However, things go awry when Lincoln accidentally eats some of Lisa's memory-erasing jelly beans.