|This article relies on references to primary sources. (December 2007)|
|The 4400 character|
Megalyn Echikunwoke as Isabelle Tyler
|First appearance||"Wake Up Call"|
|Last appearance||"The Great Leap Forward"|
|Created by||René Echevarria
|Portrayed by||Megalyn Echikunwoke (adult)
Jordan Lasorsa-Simon (Toddler)
Madison Pettis (child)
|Relatives||Lily Tyler (mother)
Richard Tyler (father)
Lily discovers quickly after her return she is pregnant. The baby inside her is capable of communicating with her, making Lily feel unwell if there is danger- or, in the case when Lily sees her daughter, Heidi, when the baby is jealous. Lily knows early on that the baby will be a girl.
When Jordan Collier attempts to stop Lily and Richard from leaving his complex, he touches Lily's stomach. The fetus inflicts severe injuries on him, that even Shawn Farrell cannot fully heal months later.
As Lily is being driven to the hospital in labour, the trees lining the road actually bend down towards the car as it passes.
After Isabelle's birth, Lily, Richard and Isabelle went on the run from NTAC and Jordan Collier, with Isabelle using several powers to aid the family in their situation. As they were being chased by a deranged family of 4400-haters, she first made fruit grow on plants and later forced the armed men to shoot themselves. The family were eventually persuaded to return to the 4400 Center, in large part as Isabelle seemed to trust Jordan Collier's sincerity. She also apparently healed the remaining damage she had inflicted on him.
However, Isabelle still sensed that Collier was dangerous and greedy. When his death was predicted in a vision of Maia Skouris', Collier asked Isabelle for advice. The baby Isabelle showed Collier a vision of what she knew he wanted to see - prestige and glory. This vision persuaded Collier that he was safe but he was assassinated shortly after.
As the 4400 became ill as a result of the promicin inhibitor, Dr Kevin Burkhoff stated he could develop a cure using uncontaminated blood that contained promicin. Isabelle had not been treated with the inhibitor, as her parents had gone on the run from NTAC before her birth, so her blood was used to heal Shawn Farrell and consequently all 4400s, unbinding their abilities. At the end of Mommy's Bosses she aged to adulthood, and walks into Shawn's office, naked.
Dr Burkhoff finds a link between Isabelle's aging and Lily's sudden aging to that of an elderly woman. As Isabelle's body grows stronger, Lily's becomes more frail, inflicting diabetes, arthritis, and other diseases on her. Burkhoff believes the only way to save Lily would be for Isabelle to actually die; Isabelle tries to commit suicide by jumping from the roof of the 4400 Center, but is unharmed. She is chastised by Matthew Ross, who informs her that she is indestructible and of vital importance to the future. Lily finally dies of old age, after giving Isabelle her own grandmother's ring.
According to Ross, her purpose is to eliminate all of the 4400, as not everyone in the future believed they are a beneficial thing. This was confirmed later in season 4, when Isabelle was described by 4400 Curtis Peck as being the "ultimate weapon" of the anti-4400 faction in the future. Isabelle refused to believe it, saying that (as described by Shawn Farrell) being good or evil was a matter of choice.
Isabelle is still, however, a dangerous mixture of youthful innocence and deadly power. On Ross' advice, she begins a sexual relationship with Shawn, one that her father strongly objects to. She finally rejects Ross' influence, and plans to marry Shawn, despite his clear statement that he wants to end the relationship. Isabelle responds with a veiled threat, stating that they were the two most powerful people on the planet- and that, without his "good" influence, she may do terrible things.
Isabelle begins secretly working with Dennis Ryland, to ensure "the balance of power" between 4400s and non-4400s is maintained. Promicin is extracted from her blood, and used in Ryland's super-soldier program. Still engaged to Shawn, her intense concern for his well-being leads her to torture and kill several members of the Nova Group in an attempt to track down Daniel Armand, who afflicted Shawn with paranoid schizophrenia. She is detained by NTAC but there is no evidence to tie Isabelle to the murders, forcing her to be released.
After the resurrected Jordan Collier bars her from the 4400 Center, leaving her marriage plans in ruins, Isabelle openly allies herself with Dennis Ryland. When Isabelle and Ryland find what is apparently the storehouse of stolen promicin, Boyd Gelder detonates a suicide bomb. This attempt to kill Isabelle enrages her, and she goes on the rampage, killing 4400s at the Center in an attempt to lure Collier to her. In the onsite schoolroom, she is about to murder the children, beginning with Maia Skouris, when her father Richard Tyler manages to inject her with the serum sent from the future; instead of killing her (as everyone expected), it strips her of her abilities. She is then wounded by Tom Baldwin and taken into custody.
In prison for her crimes, Isabelle is visited by Tom Baldwin, seeking information on his wife's whereabouts. Isabelle directs him to an art gallery, where a picture of Alana hangs- painted in 1885. How Isabelle knew this is unclear; it is implied that her connection to the future may have somehow been responsible, but is also likely that she saw the painting in one of the many books she read after growing to adulthood, and remembered it after the timeline was altered by Alana's re-abduction.
Isabelle is offered the chance to move to a less secure facility. She gives a blood sample, and is later told that the serum given to her by Richard also induced a fatal allergy to promicin; she will never regain her abilities. However, the transport that takes Isabelle to the facility crashes in a car accident. Kyle Baldwin, at the scene because of his ability, helps Isabelle escape and takes her to his family's rural cabin.
In The Truth and Nothing But the Truth, Isabelle reveals that despite the fact she no longer has her powers, she has kept her massive intelligence and memory. Due to her knowledge of numerology and cryptography, Isabelle helps Kyle decode the White Light "bible", revealing essential information about the future of Collier's movement and a list of people who must take promicin. Kyle and Isabelle later meet Collier, and form an alliance with him. Isabelle reveals the reason she wants to help Collier is to give her life meaning, and seek redemption for her past atrocities. Collier warns her that at the slightest sign of making him "nervous" her invitation will be terminated, presumably with her life.
After the movement journeys to Seattle, Kyle brings Shawn to meet Collier, and Isabelle tells Shawn that she knows he will never forgive her- but she needed him to know how sorry she was for her past acts. When Maia Skouris enters Promise City to warn Collier his life is in danger, Isabelle tells Maia that she's sorry for hurting people Maia cares about. Maia scornfully responds that some things are so bad, saying "sorry" isn't enough.
When Isabelle's father Richard Tyler returned and met her at Promise City, he mentioned how sorry he was that he was unable to teach her right from wrong. He used his ability of telekenesis to stop the flow of blood to her brain to render her unconscious. He then gave her water that later caused her to regress until she was a toddler. Unknown to Isabelle the water had been influenced by a 4400 with the special ability to reverse aging.
In One of Us, after returning to the developmental stage of approximately two years old she resumes life as a contented and happy toddler with no memory of her adult life. Richard, her father, is happy. However, her mother Lily Tyler reappears in Isabelle's and Richard's lives. While she doesn't know how she got there she is unhappy about how Richard took away Isabelle's life as a young adult and all she had learned. Lily is really a projection into his mind by another 4400, Byron Lillibridge who vanished on February 28, 1966 and Kyle Baldwin in Promise City, although she appears and feels real both to herself and to Richard. She soon is returned to whence she came. Richard, realizing it was wrong to take away Isabelle's adult life reverses the youth process with the help of another 4400, Cora Tomkins who disappeared on November 2, 1950 (making her a contemporary of Richard who disappeared seven months later in May 1951). She was the one who produced the water like substance that reverses the aging process. She also has the ability to restore the person to the age that person was before and returns her to her early 20's age. She and her father are soon captured by Tom Baldwin, who is really under the influence of an enigmatic anti-4400 faction from the future known as the "Marked" (which Matthew Ross was a member of). After regaining her powers and being strong-armed into helping the Marked, she resumes her bloody campaign against the 4400 and kidnaps Collier, but ultimately rebels once again, sacrificing herself to free Collier and freed Tom, who had come to Collier's aid beforehand. This was because the marked had already injected a killing switch in her system while she was taken in custody in prison when her father had temporally stripped her off her multiple abilities (an insurance policy) in case she would rebelled against the Marked. Isabelle used her powers and was also killed when the switch was activated. She was able to use her abilities over the guards but her final encounter with a Marked proved itself deadly.
Isabelle possesses several paranormal abilities, though they were temporarily removed by an injection sent by the people from the future:
- Control over other 4400 powers
- Tissue regeneration
- Increased Learning
She was not affected by Shawn Farrell's ability to drain someone's life-force. Note that many of these powers duplicate those from among the 4400.
She had worked with Haspel Corporation and was the source of the promicin they used in attempts to induce 4400 mutations in people who were never abducted. She left after HaspelCorp's team was destroyed by Boyd Gelder's suicide bomb. Afterwards, she moved to attack the 4400 Center but ended up losing her abilities when her father used his telekinesis to inject her with a serum given to Tom Baldwin by the people from the future. She was shot by Baldwin, but survived, and was held in custody. In the fourth season premiere, she was visited in prison by Baldwin, who was looking for information on his missing girlfriend, Alana, believing Isabelle would have the closest connection to the people from the future.
During the episode Fear Itself, it is revealed by a prison official that Isabelle has contracted a promicin allergy and would die if she takes the promicin shot, made available by Jordan Collier to try and regain her abilities.
During the episode One of Us, it is revealed that the agent from the future who is possessing Tom Baldwin intends to restore Isabelle's powers, via complete blood transfusion, and in the episode Tiny Machines, she is seen using her powers on Jordan Collier's body guards.