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.
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.
When Ariel acts strangely, Allison becomes worried that her daughter might be possessed with the spirit of a murdered stripper who wants revenge on her killer.
When Allison's friend with cancer suddenly dies she suspects a hospital employee may be at fault. Meanwhile, Bridgette writes a story that closely follows what later happens at Joe's job interview.
Allison believes she is having after effects from her recent brain surgery after experiencing strange symbols as visions. However, as the story plays out, it seems the symbols may be the key to uncovering the true identity of a serial killer.
On the 100th episode of Medium, an infant is kidnapped and Allison investigates the disappearance. But when she becomes too obsessed with the infant, Joe starts to get worried about her. Meanwhile, Bridgette and Joe are surprised after Marie manages to play the clarinet without any issues even though she hasn't attended any classes, while Bridgette is struggling to play.
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.
When Allison's car is wrecked, the SUV she rents turns out to have some unusual features, including a satellite radio that allows her to hear other people's conversations.
Allison fears the worst about Ariel's new boyfriend when she suspects him of murdering a man. Also, Bridgette posts embarrassing videos of a man on the Internet and gets into trouble.
Odd things occur for Allison, starting with her new sensitivity to light and the fact that the sunglasses she wears shows mysterious numbers that can tie into people's life expectancies. Like that wasn't enough, Allison has a dream about Joe's dad, causing Joe to begin taking better care of his health.
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 teams up with a dead man to help solve a case, only to realize she's been hoodwinked.
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.
Allison believes that a paranoid schizophrenic girl was framed for her parents' murder years ago. Meanwhile, Bridgette suffers through the agony of her first crush on a guy friend.
With everyone caught up in the sensational trial of luscious young Gloria, accused of the murder of her 93 year old husband, Allison begins seeing the face of a man named Fred everywhere she goes.
After Allison is mugged, she decides to take charge by enrolling in self-defense classes. Also, Devalos investigates a teenager's rape and an undercover cop's possible murder, and the suspect may have very close ties to Scanlon.
It's 1993, and a pregnant Allison is about to marry Joe. But when she has a premonitory dream about one of the wedding guests, and Joe treats the incident with awkward disbelief, Allison gets a bad case of cold feet just as the wedding march starts to play.
Allison and her daughters dream of the same mysterious girl who may be linked to the bizarre serial murders of entire families. Joe and his boss find themselves at odds while working on a major project.
Allison bonds with the mysterious girl from her dreams who she now must protect when the serial killer eyes the girl as the next target.
After a neighbor is murdered, Allison's fears for her own family prompt her to install a high-tech talking burglar alarm, which she later suspects may be communicating with Marie. Also, Ariel meets a ghost who could help her get into the college of her choice.
A distressed Ariel begins to lose hours and then years of time in her life and must look to her future self to find out how to get back to the present.
When an animal rights activist working undercover at a farm goes missing, Allison befriends a pig that could hold the key to the woman's whereabouts. Also, Joe's special birthday gift from Marie leaves him wondering how she was able to obtain it.
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.
While investigating a rash of murders, Allison sees floating symbols above people's heads, signs that she thinks could match them with their perfect mate. Also, Joe is put in a tough situation when one of his employees accuses another of sexual harassment.
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.
While investigating a missing girl's murder, Allison experiences more friction with Scanlon after finding a possible link to his late brother. Also, Ariel deals with her siblings' reactions to her leaving for college.
When Allison gets a skin graft on her hand after a burn, she is puzzled when the same hand acts with a mind of its own, gesturing uncontrollably. Also, Bridgette keeps her real role on the soccer team a secret from her parents.
When Allison begins having flashes to a specific time in the future, her sense of dread grows as she feels more and more powerless to stop a catastrophic event from occurring.
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.
A series of mysterious fire-related deaths may be tied to Allison's dreams of a blaze. Allison must also think about where her professional career is headed, as Devalos starts thinking seriously about running for mayor.
Allison's visions about the convicted sex offender new to her neighbourhood have her questioning his guilt, even though her neighbours are furious about him moving in. Plus, Joe's potential career opportunity doesn't mesh with Allison's professional future.
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.
Allison's dreams question her brother's recent good fortune; the Devalos campaign sees Bridgette as an asset.
A man wants Allison to help discover how his wife disappeared; Marie's breakdown in school causes concern for the Dubois parents.
When Allison becomes a lawyer and Joe starts a new job, the Dubois family is forever changed.