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 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.

After somehow seeing Capt. Kenneth Push in a vision at a murder scene, Allison calls upon his assistance to find a serial killer. However, the only way Capt. Push can help is by literally putting his life on the line.

While Capt. Push lingers between life and death, Allison struggles to decipher confusing messages from the other side in an attempt to stop a serial killer before he claims his next victim.

Allison is having dreams about an old high school friend and decides to find her. Meanwhile a man seeks the district attorney's help in finding his daughter who has been missing for a week.

Allison dreams about hitting a girl with her car and a woman who's house is haunted. She finds out that the woman killed herself. Now Allison is trying to put all the pieces together.

Allison repeatedly dreams about a woman who is being watched by a stranger in her bedroom.

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 and Bridgette continue having the same odd dreams as Allison comes closer to figuring out what the dreams mean and how they relate to a series of shootings/killings. Clay still won't leave Allison's house, but his purpose eventually becomes clear and Allison's opinion of him changes. Meanwhile, Devalos' health is evaluated after a rush hospital visit and Scanlon's relationship with the mayor's liaison Lynn takes a turn for the worst.

Allison dreams about the same day over and over again. Each time she finds more important clues. Joe tries to get affection from Allison. Ariel has problems at school.

Arliss Howard reprises his role as Texas Ranger Kenneth Push, who returns to Allison's life when he experiences unnerving visions about a Phoenix-based slaying. Meanwhile, Joe tells a little white lie---and suffers the consequences.

Allison has recurring dreams of her past, causing strange and shocking changes to her current life. Her dreams of the past threaten her life in the present as she tries to stop a predator before he strikes.

Time is of the essence when a disgruntled worker with nothing to lose takes Joe and three others hostage. Allison and Ariel are plagued by an overwhelming feeling of dread, as police mobilize to bring the hostage situation to an end.

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.

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.

Delavos receives help from Allison when he investigates the murder of his friends sister. But the case is taken into an unexpected direction when 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 dreams of a ghost who was a witness to several murders. Meanwhile, Ariel has a strange reaction to an assignment in health class.

Allison wakes up under a freeway overpass, not knowing where she is or how she got there. Her lack of recent memory causes her to start thinking she may have killed someone with her car.

While Allison is coping with Joe's job relocation to San Diego, she dreams about and then subsequently meets a bank teller named Mrs. Boddicker who predicted a robbery at her bank.

Allison and her family deal with the outcome of her brain surgery and its possible lasting effects. Also, a local television station owner asks Devalos and Scanlon to look into the possible stalking of his sportscaster, who is also his wife.

The film "Night of the Living Dead" gets Allison nightmares where scenes from the movie are put in her mind. It results in her getting cuts and bite marks and even clues that lead to hear funeral director's killer.

Samples of a lethal viral disease vanish, a dire development that pushes Allison to tap into her extrasensory ability to foil a possible large-scale bioterrorism attack. Meanwhile, Scanlon prepares to pop the big question to Lynn (Tina DiJoseph), but Bridgette's visions indicate that their relationship could meet an ill-destined end

Allison wrestles with a particularly disturbing dream, all while trying to figure out why a recently paroled convict is so intent on destroying her boss.

When Allison's brain tumor resurfaces, its aftermath could have life-altering consequences for her friends and family, on the sixth season finale of MEDIUM.

When they have the same dream about a missing homeless man who is the subject of Allison's most recent case, Bridgette and Allison swap personalities, causing mayhem at home, at school and with the investigation.

Scanlon is haunted by dreams of his late brother, leaving Allison concerned about her colleague. Also, while making her final preparations for college, Ariel has visions of missing young women, past and present.

Suddenly unable to understand the spoken word, Allison's marriage shows signs of strain and she develops an unexpected friendship with a linguist. Unable to communicate with his wife, Joe reaches the limits of his patience being married to a woman who is a slave to her visions.

Allison dreams of a murder that involves a man being struck by a train and, when a man is killed just like in her dream, Allison is convinced it's a homicide. Also, Joe has difficulty handling his mother's diagnosis.