Lincoln and the Louds are ecstatic to welcome their new Gran-Gran, Myrtle, into the family with a tropical wedding celebration; but the festivities are cut short when an old nemesis…

Lincoln and his best friend, Clyde, struggle to decide whether to participate in the Loud family Spooktacular, attend their friend, Xander’s, party, or go trick-or-treating on Halloween.

The Loud family travel to Scotland and discover they are descendants of Scottish royalty as they move into their giant ancestral castle.