Abilities and Powers
As humanoid extraterrestrials, they possesses extraordinarily strong abilities and that ordinary human beings do not.
Sara has the psionic ability to telekinetically move and control objects with her mind alone, and can speak telepathically to animals as well as read the minds of people nearby. Like her brother, she is immune to bullets and can stop such weapons in their tracks with her telekinesis.
Seth has the ability to change his own molecular structure, enabling him to pass through solid matter. He is quite durable and has incredibly high agility, reflexes and near-invulnerability to most damage. He is also unhurt by bullets.
Seth and Sara lived on a dying world, but their parents who are scientists, sought a way to save their planet without invasion but were arrested before completing their experiment. The teenagers came to earth to retrieve the successful results, but the alien government sent the assassin to stop them. They crash landed in the Nevada Desert and stole some civilian clothing and boarded a bus. They then stopped at Las Vegas and got into a cab owned by Jack Bruno.