The Unwelcome Riders

The Unwelcome Riders are a group of monsters from America’s Shadow. They are related to the Unbidden Homesteaders.

Description
The Unwelcome Riders don't look human, they seem to be vaguely humanoid however as they are still described as people. Their faces are very long and pale and there's something wrong about their eyes.

They seem to be mostly bound to one area, unless they are in someones car. The Green River Tunnel Family for example appears in the cars of lonely travelers who drive through the Green River Tunnel.

Families
There are eight families of Unwelcome Riders. One of them are the Green River Tunnel Family who Malcolm notes to be the family least likely to go through with "their ritual". This could mean that they're the least powerful of the families.

The Green River Tunnel Family relocated to the tunnel after its creation in 1966, before that they haunted an old roadway that's been in use since the Oregon Trail. They were first seen on the trail in 1848.

Powers

 * Appearing out of thin air
 * Corrupting things (like stroking someones head until their hair falls out)
 * Making people disappear

Dos and Don'ts

 * don't ask questions in their vicinity, they don't like questions
 * don't stop driving unless you're in a parking lot with an uneven number. They like uneven numbers and seem to be distracted by them.
 * do cut an x into your hand until it bleeds

Salt could be useful against them. It seems to be effective against Unbidden Homesteaders and since they're related it might help ward the Unwelcome Riders off, too.

Continuity
The Unwelcome Riders appear in the following episodes:


 * Ep 02 - Do Not Ask Questions
 * Ep 06 - Broken Mirror (mentioned)

They are also mentioned in the bonus Q+A on the A Voice From Darkness Tumblr:


 * Dr. Ryder Responds - Question 1: Someone in my Rearview Mirror
 * Another Question

Trivia

 * They are based on the hitchhiking ghosts in the Disney’s Haunted Mansion ride.