Fleeing an unseen force controlling their minds, an old man and his two nieces hijack a woman’s car only to discover she’s already picked up a familiar hitchhiker.

Good points by Nir Shelter. ?Especially about the need for a consistent "dramatic mechanism" ?that sustains the motivation of the character from episode to episode. And creates endless complications -- that propels the plotline forward. ?The producer will want to sense that about the character.

"Dexter" is a good example. He's gotta kill -- that's his psychopathology, the compulsion that drives him, that complicates his professional and personal life in every episode. ?Dexter's defining characteristic was the hook for series.

What's the character hook in this series? ?

It's the characters not the situations that lay the foundation for a series.

Good points by Nir Shelter. ?Especially about the need for a consistent "dramatic mechanism" ?that sustains the motivation of the character from episode to episode. And creates endless complications -- that propels the plotline forward. ?The producer will want to sense that about the character.

"Dexter" is a good example. He's gotta kill -- that's his psychopathology, the compulsion that drives him, that complicates his professional and personal life in every episode. ?Dexter's defining characteristic was the hook for series.

What's the character hook in this series? ?

It's the characters not the situations that lay the foundation for a series.

When dealing with a concept for a series one of the most important elements to consider is the "dramatic mechanism", this could either be a character dynamic (Friends), a psychological condition (Dexter) or a work place requirement (30 Rock) that enables the invention of a dramatic situation in every episode.

The "mechanism" I can see in your concept is the family's need to hunt the monsters. This is good, however it needs motivation that's currently lacking. Just as it's clear why a priest must?fight a demon or Buffy must fight vampires, your family of monster fighting heroes need to be clearly motivated to do the voodoo that they do so well.

Perhaps describe them as descendants of ancient guardians tasked with the protection of humanity against the armies of hell. Just an option, but it explains what I mean about the need for them to be more than a Brady bunch on the hunt.