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In the Season 4 finale, Mary's work interferes with Brandi's wedding when Mary is forced to look after her least favorite witnesses.

Mary protects a courtesan from a gangster, who's the father of her unborn child. While Mary gets a crash course in childbirth, she must also decide if she can trust the woman.

Mary protects a deeply remorseful Army veteran and clashes with his military lawyer. Adding to her worries is a visit from her ex-husband.

Marshall and Stan contend with a rock-star witness and her controlling mother while Mary is away on a WITSEC-mandated road trip.

A man is forced to enter WITSEC because of his twin brother's actions. Mary must protect them both from outside enemies and from each other.

Mary counsels a divorcing couple in WITSEC in order to keep their family safe. To help her cause, Mary must learn about Hindu tradition in hopes of guiding the pair to work things out.

Mary helps a terminally ill man reconnect with his estranged children

Mary protects an Amish witness who must contend with culture shock and people who mean her harm

Mary reluctantly teams up with a remorseless con artist to go after an even bigger criminal.

Mary counsels a teenage pageant queen who discovers she has been unknowingly living under witness protection.

A witness's romantic entanglements with a suspect fluster Mary, who acts as a go-between for the pair

Mary helps a paranoid whistle-blower connect with his son

Mary seeks help from a witness to help clear Brandi of grand theft auto charges in the Season 4 premiere

After a priest witnesses the murder of a parishoner, he will have to give up his special vocation in order to enter WITSEC.

Mary keeps an eye on a teen witness whose separated parents are too distracted by their own issues to pay attention to their daughter. Elsewhere, Marshall thinks a witness may have betrayed his brother; and Brandi tends ...

Mary helps her latest witness, a homeless man who's struggling with the program, find his birth parents. But the search could cause more problems than she anticipated. Elsewhere, Scott asks to borrow more money, raising ...

A witness with Asperger's refuses to testify against her friend, frustrating Mary. Elsewhere, Marshall and Stan try to prevent the deportation of a key witness, and Brandi comes clean about her investment plan w

Summary: A woman wants to escape from her family, who are heavily involved in organized crime, but a secret from her past puts her eligibility for witness protection in jeopardy. In the face of these obstacles, she turn...

Marshall is being evaluated in the field by his father (Geoff Pierson) during a joint fugitive operation. Mary meets Brandi's secret friend.

Mary's new witness is part of a mortgage fraud ring and is an important link in the case of FBI Agent Faber, whom Mary met a few episodes ago.

Mary helps a paroled witness acclimate to life on the outside; Marshall helps out when one of Mary's witnesses becomes the victim of a revenge plot

Mary's new witness falls in love for the first time; Mary must stop her witness from taking out his pain in the form of an explosive device.

An FBI informant refuses Witsec protection and gets himself in a heap of trouble; Stan works with a witness suffering from pugilistic dementia

Summary: A witness against a weapons trafficker wakes up from a three-year coma.

Summary: In 2003 Mary meets Marshall for the first time as they get lovers CLAUDIA TOBIN and HENRY DOER into the WitSec program, and it's a toss-up whose relationship is going to last: Claudia and Henry's, or Mary and M...

Summary: Mary's slow recovery doesn't hinder her determination to speedily track down the guy who shot her and bring him to justice.

The U.S. government enlists WITSEC to hide one of Latin America's feistiest political activists, but everything goes south when the budding Evita moves to the bad part of town.

When a Wall Street blue blood rats on his boss' investment fraud and hides out in WITSEC, something from his past life comes calling.

A world-class counterfeiter witness is suspected in a murder; Mary and Marshall realize they may be hiding a witness from the government.

Mary serves as technical advisor for a new training video; Marshall arranges to get one of Witsec's charter members, a former Philadelphia mobster, to his son's funeral.

The barely legal daughter of Mary's witness, a Miami racketeer, is in a dangerous romance; Raph's mother visits to prepare an engagement feast for surprised Mary.

After briefing a new witness, whose testimony is contingent on visitation rights with his son, Mary learns the son is missing and sets out to find him.

FBI agent O'Connor arrests Brandi on charges of drug trafficking and murder. Insisting her sister is innocent, Mary works to help Brandi while ultimately trying to discover O'Connor's real motive for his actions.

When a series of murders seem to follow a new ex-con witness, including stabbing Mary's friend, she and Marshall have to figure out if he's the killer in time to save his next victim.

When a bridge collapses and plunges many to their death, the victim's families come after the engineer, who - once in Witsec - attempts to clear his name no matter what the consequence.

When Stan's first witness turns up dead, with his badge amongst the bones, he becomes the Chief suspect - forcing Mary & Marshall to dig deeper into a 20-year old love triangle.

A shady figure begins following Mary's newest witness.

When a witness is trapped in a collapsed building, Mary must keep him alive while guarding him from his former partner, who may be targeting him from a nearby building. On the ground, Stan and Marshall must fend off a de...

An irresponsible mother and her three children enter the program and Mary tries to straighten everything out. The eldest son is shown caring for the younger children at the beginning of the episode and this continues int...

A northern California marijuana mastermind cannot testify without using the drug to neutralize his anxiety disorder.

US Marshals Mary Shannon and Marshall Mann come back together to help another witness.

Season 1 ends with Mary fearing for her job after Brandi's involvement with drug trafficking is revealed. Meanwhile, Stan and Marshall take on a special assignment.

After watching her mother audition for "Sweet Charity" Mary is kidnapped; in New Jersey, Brandi's boyfriend Chuck is abducted and two FBI agents are killed; when federal agents suspect a connection, a nationwide manhunt ...

Natasha, the Ukrainian accountant from the pilot episode, has new breasts and a new boyfriend, Serge. However, complications arise when she discovers he is also in the Witness Protection Program.

Mary has a one night stand with a witness. Problems arise when he is accused of murder.

A member of the Program under Mary's watch is in a car accident and Mary has to find out if it was an accident or related to his former life.

The closeness of a family is tested when they enter the program after the daughter witnesses a shooting.

In "," Mary learned that her very first witness, Chris Worley, is now an NCAA basketball star, but has a gambling problem that threatens to destroy the new life he and his brother spent 5 years building.

Mary works to solve the mystery of who tried to kill her witness, an art dealer. To complicate matters, both his mistress and his wife are in the program…and key suspects.

Mary and Marshall are caught in the cross-fire of a contract killer while transporting a particularly irritating witness.

Mary's assignment this week is Treena Morris a con-artist who is married to a diamond smuggler. After she is arrested by the feds, she decides to tell all on her husband and his friends. While Mary is trying to keep he...

Things get complicated when Mary takes on the case of Leo Billups. Leo saw his mother murdered and is going to testify against the people who killed her including his father.

In the first episode we meet Mary Shannon a US Marshall for the Witness Protection Program. In this episode Mary tries to figure out what went wrong when a mobster's son who was under her protection is killed.