Mary uses a thief to catch a thief when she asks a witness to consult on a crime in order to exonerate Brandi of grand theft auto.

Mary helps a paranoid whistle-blower connect with his son.

When a Financial clerk sees a murder happen in front of him, he is forced to enter the program, but refuses to take down his friend's wife, who he is madly in love with. In Romeo and Juliet kind of love, these two star-crossed lovers will do anything to be together.

Mary helps a Miss Congeniality teenage pageant queen cope when she suddenly realizes that she's spent her entire life in the witness protect program - but didn't know it.

Mary's latest witness is a smooth-talking con man, who finds it impossible to leave behind his life of swindling other people even while in the witness protection program. But despite discovering that he has failed to leave his old ways behind, Mary is even more frustrated to learn that his inside connections to a major weapons trafficker make it impossible for the federal government to drop him from WITSEC -- and instead requires that she and Marshall go undercover with him to try to catch the weapons dealer.

After a young Amish woman witnesses another member of her community gunned down by members of a biker gang, she and her husband reluctantly enter WITSEC under Mary's and Marshall's supervision. Soon, however, it begins to appear that her husband likes leaving the restrictions of Amish life behind much better than his wife, making it difficult for her to adjust to the ways of "the English." In the meantime, Mary becomes increasingly puzzled by her sudden weight gain, craving for sweets, and revulsion at the taste of coffee.

Mary must help a terminally ill father heal a tarnished relationship with his distant children.

Mary is in charge of a Hindu family with strong traditions. In order to keep everyone safe, she counsels a divorcing couple in WITSEC. In the process, Mary learns about Hindu tradition so that she can bring the family closer together rather than apart.

Mary gets a WITSEC two-fer, when a witness is forced to enter the program after being mistaken for his "evil" twin brother. Not only must she protect the pair from their enemies, but also from each other.

When Mary's WITSEC mandated road trip turns into an introspective odyssey, Marshall and Stan are left to deal with a rockstar witness and her overbearing mother.

Mary helps protect a guilt-ridden army veteran, while butting heads with his JAG attorney.

Mary learns all the joys of childbirth while protecting a courtesan from the gangster that impregnated her. Although Mary may be immune to her charms, can a seductress truly ever be trusted?

On the day of her sister's wedding, Mary is flown to Miami in order to protect her least favorite witness from hired mercenaries.