Gayle Marsh

"Fear is not a lie. Fear cripples. Annihilates spirits. It is the only weapon that matters. Fear made me stronger than you. No-one is safe from it! ...why aren't you scared anymore?"

- Gayle Marsh

Gayle Marsh, nicknamed Psi by authorities, is a bank robber from Skokie, Illinois, who went to National City to continue her mass bank robbing using her incredibly powerful psychic abilities.

Biography
Gayle lived in Skokie, Illinois, where she lived a seemingly normal and calm life. One day, she snapped and started robbing banks. With her powers virtually causing everyone around her to instantly submit to fear, it allow her to nonchalantly perform her robbing spree wherever she went. She eventually set her eyes on National City, and moved so she could rob banks there.

Once in National City, she caught the attention of Supergirl, who attempted to stop her. However, Gayle immobilized Supergirl by preying on her claustrophobia, and forced Supergirl to relive the most traumatizing moment of her life. Gayle then attacked two other banks, but Supergirl was unable to stop her both times. She also got in a psychic battle against J'onn J'onzz, who was attempting to shield Supergirl from her psychic attacks. However, she ultimately beat him, and crippled him to the ground in pain before she escaped once more. Following that, during her biggest robbery yet, she debilitated a number of police officers, forced a construction worker to release a wrecking ball, and destroyed numerous police cars and businesses, before she was finally stopped by Supergirl who was able to overcome her fear and knock Gayle unconscious. Psi was then taken into custody by the D.E.O.

She was later recruited personally by Supergirl to go with her into space where Fort Rozz was seeing as Supergirl needed backup due to being powerless due to a blue sun being in that area of the galaxy. However as a precaution her powers were suppressed by a device dampener on her head. Psi and Livewire toss insults back and forth on the flight before alerting they're at the destination. Kara takes off the dampener off Psi's head so she will be useful however Psi momentary loses control on Saturn Girl later promoting the device despite proclaiming it was a accident. Seeing Reign arriving Irma unlocks the dampener and sends Psi out to warn the others about the arrival. Psi arrives right as Livewire is mortally wounded and makes Sam reemerge due to making Reign live out her worst fear mentally prompting her to flee. Psi then witnesses her body dissolve into electrify. Back at the DEO Psi is personally thanked by Supergirl and in return she extend her sympathies for Supergirl losing her friend. She's then given a room upgrade as a personal thank you.

Personality
Gayle was stated to be a very kind woman before she just snapped. She is shown to be very cold and calculating always thinking about her next step. But she’s also reckless because of her overconfidence in her powers, going in blind. She’s ruthless, not caring about what people’s fear will do to their mental health. She has a liking to poetry saying “Lady Bird, Lady Bird. Fly away home. Your house is on fire, and your children they will burn.” But she revealed there is still some good in her as she saved Supergirl from Reign, putting herself in danger. In fact, she proved herself so much that Kara requested to give her a better cell.

Powers and abilities

 * Telepathy: As noted by J'onn J'onzz, Gayle's psionic powers are very unusual. While she is unable to actually see into another's mind or control what they think and do, once attacking one's mind, she is able to instantly trigger their greatest fear. This forces them to experience such a believable illusion that it leaves them in a traumatized state. Her powers also allow her to detect the presence of others, preventing them from sneaking up on her and likewise able to repel another telepath's attack on her to overwhelm the intruder. Her powers can also unleash powerful psionic blasts, able to overwhelm beings as powerful as Supergirl, overwhelming her into being launched clear across the city block. Even Reign herself was brought to her knees by Psi's powers, forcing Samantha's personality to momentarily resurface.
 * Fear Projection: During the conflict between her and Supergirl, Gayle was able to project fear into her.
 * Psychic Link: During a conflict with Supergirl, Psi was able to determine, with relative ease, that J'onn J'onzz was attempting to shield Supergirl's mind from her attacks. Psi was also shown able to defeat J'onn's mental influence in Supergirl's mind.
 * Psychokinesis: Through her powers, Gayle is about to move and otherwise control objects with her mind.

Weaknesses

 * Indomitable Will: While her powers can not be blocked once unleashed, an individual with a strong enough will can overcome the psionic attacks, leaving Gayle completely defenseless as she has no other means to defend herself.
 * Overcoming Fear: A weakness of Psi's powers; if someone under her influence is able to overcome the fear she projects on them they become unaffected by Psi's influence. This is shown when Supergirl is able to become unaffected after overcoming the fear of having potentially killed Mon-El by sending him away after Alex is able to convince Supergirl that Mon-El is still alive.
 * Psychic Dampener: If Gayle is wearing this device, she cannot use her powers.

Behind the scenes

 * In the DC comics, Gayle Marsh is a villain who, at the age of twelve, developed psychic powers.