Frost Sisters

The Frost Sisters, also known as the Three-in-One, are a set of telepathic triplets whose abilities are greatest when in close physical proximity of each other, as they share a hive mind-like connection.

History
Two months prior to eXploited, they infiltrated a rally for Senator Montez. Esme was undercover as his assistant named Stacy. After she talked with Senator Montez, Esme was telepathically warned by Sophie and Phoebe that Sentinel Services had arrived to capture them. They told Esme to run and escape as they were being taken by Sentinel Services. While Esme escaped, her sisters telepathically told her to find them. Sophie and Phoebe were then taken and imprisoned at a facility. Despite her immense power, Esme knew she couldn't mastermind a prison break on her own, so she had her unknowing allies plan and lead an attack on Trask Industries after informing them of the Strucker parents so called deception with everyone realizing that it was too late once they found Esme manipulated all of them.

Season 1
To Be Added

Members

 * Esme Frost
 * Phoebe Frost
 * Sophie Frost

Physical Appearance
The sisters are completely identical, they are young Caucasian women with light skin, dirty blonde hair and blue eyes. When they use their telepathic abilities, their eyes glow with a bright blue hue, and glow even more when acting under their hive mind. They also possess the tendency to have matching hairstyles and outfits, even down to the accessories virtually making it impossible to tell one from the other.

Powers and Abilities

 * Telepathic Hive Mind: The sisters share a linked hive mind, which allows them to share thoughts, communicate mentally and maintain a continuous telepathic connection over great distances. The link is strongest when they are in close physical proximity, and their collective mind also allows for increased telepathic power and shared intellect. When the girls use their telepathy, their eyes glow bright blue, and they glow even more when acting under the hive mind.
 * Telepathy: The sisters possess the ability to read minds and project their thoughts to others. They are able to analyze people's memories and influence minds, as seen when Esme implanted a vivid nightmare into Polaris' mind while she slept. Though they individually possess their own telepathy, their telepathic abilities are greater when the girls join together.
 * Empathy: The sisters possess limited emphatic abilities, as Esme could read Chloe Tans' emotions, sensing a lot of need and pain.
 * Mind Control: The sisters have shown the ability to control multiple people’s minds at the same time, as demonstrated when they forced several Sentinel Services agents to kill both their fellow agents and themselves.
 * Pain Inducement: The sisters can induce mental pain inside people’s minds, as shown when they rendered two Sentinel Service agents writhing on the ground, clutching at their heads in pain.
 * Psychosomatic Symptoms Inducement: The sisters have the ability to influence the minds of others to produce a series of illusory psychosomatic actions, that cause the body to react as if it were actually physically experiencing it; for example, they have shown to be able to induce the interruption of the respiratory tract.

Trivia

 * In the comics, they are known as the Stepford Cuckoos, a set of telepathic quintuplets and one of the clones of Emma Frost. The clones were created by the Weapon Plus program (the same program that grafted adamantium to Wolverine's skeletal structure and gave Captain America his superhuman abilities). The project was code-named Weapon XIV, and the goal was to create thousands of telepathic clones of Emma Frost (one of the most powerful telepaths on the planet), that when combining their telepathic powers into a hive-mind, they would be capable of killing every mutant on the planet. Five of the clones were sent to infiltrate the Xavier Institute, to both gain the X-Men's trust and hone their telepathic abilities, and there, those five clones (Esme, Celeste, Phoebe, Irma and Sophie) took on the code-name the Five-In-One, or as they were more commonly referred to as - The Stepford Cuckoos. Sometime after their initial introduction, Esme Cuckoo had ingested the mutant drug Kick (which was coincidentally mentioned in the series, in the episode Esme was first introduced in) to boost her telepathic abilities, and that was ultimately one of the contributing factors to her eventual death at the hands of Xorn. Esme had also influenced her sister, Sophie, to partake in the drug and that eventually led to her death due to overdose. After those events, with only three sisters remaining, the Five-In-One became known as the Three-In-One.
 * While in the comics they are almost always referred to as the Stepford Cuckoos, in the series they are collectively called the Frost Sisters. Also in the comics, their last name is Cuckoo, while in the series it is Frost.
 * In the episode 3 X 1, after stating that their last name is Frost, Sage continues on saying that the sisters often use new aliases to maintain a degree of anonymity. She also says that when Phoebe and Sophie were arrested, they gave their last name as Cuckoo, joking that they probably said that to annoy the authorities.
 * The moniker The Stepford Cuckoos is derived from a combination of The Stepford Wives and The Midwich Cuckoos, which are two psychological, science-fiction thriller novels.
 * During the limited comic book series X-Men: Phoenix Warsong, the Phoenix Force implies that their last name, Cuckoo, is actually a clever code. The cuckoo bird lays its eggs in another bird's nest, who then tends to the eggs until they hatch. This refers to Dr. John Sublime (the overseer of the Weapon XIV project) placing his creations, the Stepford Cuckoos, in the X-Men's nest, the Xavier Institute, to be trained in using their telepathic abilities.
 * Skyler Samuels revealed through an Instagram livestream that Esme serves as the peacekeeper between Sophie and Phoebe, establishing her as the "Ego" in their Freudian Trio.
 * In 3 X 1 it was stated by Doctor Campbell that Sophie and Phoebe were experimented on after they were brought to him.