Allison has a dream of a husband and wife committing a murder/suicide. D.A. Devalos introduces her to a friend of his, Detective Lee Scanlon, who's sister and brother in-law's deaths were also ruled a murder/suicide, and sees a connection. After learning about Allison's methods of investigation, Scanlon decides he doesn't want her help.
Allison seeks Catherine's (the psychic she talked to in "Pilot") help after learning that Joe has scheduled a biopsy exam. The psychic gives her a strange message that later comes back to haunt Allison. A case about the homicide of a police officer takes a shocking turn when Allison dreams where the murder weapon is located and is then called to the stand to testify how she obtained the information. Meanwhile, Allison fears that Joe is having an affair when he repeatedly comes home late from work.
Allison runs into the man who kidnapped her daughter in one of her dreams at the District Attorney's office. She learns that he is a "Good Samaritan" who witnessed a robbery and is fully cooperating. After learning that he has kidnapped multiple young women, Allison reaches a roadblock in her investigation that leads her to yet another unbelievable breakthrough in the case. Meanwhile, Joe tutors Ariel in math, which in turn brings Allison to another shocking discovery.
Allison investigates the supposed suicide of a girl who was dating D.A. Larry Watt's son Greg. When the girl's body is found in a ravine, new evidence is presented that implicates the defense attorney. Meanwhile, Joe is concerned about one of his colleagues after Allison has a premonition of the colleague having a heart attack.
Allison's daughter Ariel dreams that she is a young girl named Sarah being held captive by an ogre in a castle. While Joe agonizes over the possibility that both of his daughters have inherited their mother's psychic abilities, Allison tries to help Ariel and interpret the dream. However, Allison's advice provokes Ariel to run away from a field trip in order to follow up a clue.
Evidence shows that a pilot is indeed guilty of his wife's murder. However, in Allison’s dream, when the pilot is put in jail, there is a plane crash where hundreds of people are killed. Should Allison put forth the evidence to land this guilty man in jail, or let him go free in order to save hundreds of innocent lives?
Allison encounters a psychopathic doctor who raped and murdered numerous teenage girls years ago. After learning that an evil soul has been possessing people, she sets forth to stop it before a new victim is found. Meanwhile, Ariel's math teacher accuses her of cheating and Joe steps up to her defense.
Allison is lead to an art gallery where she encounters the art of a popular artist. While looking at some of his paintings, 3-dimensional images emerge that make her believe that the artist is somehow involved in a crime. Joe gets a job offer from a former co-worker. This episode originally aired with an introduction by Rod Serling and was partly in 3-D.
Allison's old flame, Clay Bicks, appears at her doorstep moments after dying, unaware that he is dead. When he accepts the fact that he's dead and will never get to be with the woman he loved, he decides he's going to stay in Allison's house so he can at least be close to her. This upsets Joe, and Allison decides that something must be done to get rid of Clay. Meanwhile, Allison shares a bunch of odd dreams with Bridgette, except Bridgette's dreams keep coming to her in the form of cartoons for some reason.
Allison is called to help Devalos investigate the shocking death of a well-respected assemblyman, but for some reason she has visions of a young boy trapped in a well mixed in with her visions of the assemblyman. She must figure out what the dreams of the young boy mean because the dreams of the assemblyman alone aren't enough for her to solve the assemblyman's death.
Allsion had a dream that takes place about 20 years in the future in which Marie dies of leukemia. Upon waking up Allison is determined to keep Marie safe no matter what needs to be done. Joe strongly disagrees with Allison's actions, and tries to convince her to stay rational. Meanwhile Scanlon investigates the sudden death of a close friend.
Allison is confused when her dreams of a man murdering his wife keep occurring, even after she helped Devalos convince the jury of the suspected killer's guilt. Through her troubles she manages to make a new friend named Debra. Meanwhile, Joe is frustrated by the therapy sessions that his job enrolled him in, and can't express his feelings to Allison because the recent hostage situation he was in is still greatly affecting him.
The investigation of the murder of Walter Paxton's wife continues, as it is now determined that a serial killer is on the loose. While helping Devalos and Scanlon with the case, Allison discovers that her new friend Debra is the next victim. Allison goes to great lengths to protect Debra, but is shocked to find that her new friend isn't who she thought she was. Meanwhile, Joe debates being part of a lawsuit against Aerodytech, the company he's been loyal to for years.
Now that Allison's special abilities have been revealed to the public, everyone's lives have been turned upside down. Allison starts to have dreams about a boy who was kidnapped from a toy store, but is unable to turn to Devalos or Scanlon for help. She decides to call the company hired by the missing boy's family and makes an unusual deal with the company's investigator, Cynthia Keener.
Joe brings a reluctant Allison with him to a party at a prospective employer's house. Later on, the employer's daughter disappears, leading Allison to connect her recent dreams about Paris to the disappearance. Now it's up to Allison to save the daughter, which coincidentally will also secure Joe a job.
Joe's mother pays a surprise visit, which worries Allison because she hasn't seen her since her psychic abilities became public knowledge. Meanwhile, Cynthia Keener tries to push Allison's dreams towards outstanding cases and Devalos and Scanlon are reunited with Allison in an unexpected way after an arson-related murder.
In the fourth season finale, Allison tries to help a young couple who thinks their house is haunted, but her efforts result in murder. Meanwhile, Meghan Doyle tries to sell her controlling interest in Joe's invention and Joe tries to save his own stake in it. Also, the election between Devalos and Tom Van Dyke takes place.
Devalos receives help from Allison when he investigates the murder of his friends sister. But the case is taken into an unexpected direction when Allison's visions involves the friend's former husband and current spouse. On the domestic front, Bridgette finds herself in trouble at school when she is caught drawing pictures of her teacher in the nude.
Allison’s possessed stalker, Lucas Harvey, continues to torment her by infiltrating her dreams and causing her to be less than reliable to Devalos and Scanlon during an investigation of serial killings. Meanwhile, Joe tries to use Marie's new gift of picking the right stock as a way to save his company.
Allison leaves her job at the D.A.'s office after she's recruited to work for the Lydecker Corporation by another psychic who works there. While enjoying her new job, Allison still regrets leaving the D.A.'s office so suddenly, and has dreams about a serial killer running loose in Phoenix. Meanwhile, extenuating circumstances cause Ariel to start taking pills.