Libby is a fictional character on the ABC drama television series Lost, which chronicles the lives of over forty people after their plane crashes on a remote island somewhere in the South Pacific.

Watros was intended to appear in two further episodes in the fourth season designed to resolve her character's backstory (after cameoing as a ghost).

Due to the 2007–08 Writers Guild Strike, those appearances were postponed to the sixth and final season, albeit in a different format.

She states in "The Other 48 Days" that she visited Vermont, where she broke her leg in a skiing accident, and she attended medical school for a year before dropping out to become a clinical psychologist.

[2] As shown in "Live Together, Die Alone", she meets Desmond (played by Henry Ian Cusick) at a café before she arrives on the island.

There, she tells him that she is from Newport Beach, California, and when she learns about his intention to join a sailing race, she decides to donate her sailboat Elizabeth, a gift given to her and named after her by her late husband David.

Prior to boarding the Oceanic flight, she intervenes during an argument between Mr. Eko (Adewale Akinnuoye-Agbaje) and Charlotte Malkin (Brooke Mikey Anderson) in "?".

The Others invade their camp and kidnap all the remaining survivors except her and six others: Ana Lucia (Michelle Rodriguez), Mr. Eko, Bernard (Sam Anderson), Cindy (Kimberley Joseph), Nathan (Josh Randall), and Goodwin (Brett Cullen).

[2] Paranoia soon afflicts Libby and the remaining tail-section survivors causing them to speculate Nathan is not part of the flight and is an Other, which leads to his death.

Mr. Eko and Jin find Michael, leading him back to Libby and the group and allowing them to start their journey.

[7] During their trek in "Abandoned", numerous tragedies occur, including the disappearance of Cindy and the death of Shannon (Maggie Grace).

[8] Once she joins the main camp, she and Hurley start to become romantically involved,[9] especially when she tells him that she remembers when he stepped on her foot in the plane.

In one scene in "Meet Kevin Johnson", she appears to Michael in the hospital as a nurse with blankets on her stomach, representing the position she was in when she was shot.

One day, she sees a Mr. Cluck's commercial with Hurley in it, and memories of her past life on the Island come flooding back to her.

When the alternate time line is revealed to be a meeting place before the afterlife Libby reunites with many of the other characters in a church.

[19] Her character was written to be in her late forties to early fifties, easy on the eyes, amicably maladjusted, and a compulsive liar so good at what she does, most people will not know she is not what she seems.

[23] IGN has described her as a "loose end" in the storyline due to the contradictions between what she tells other characters and the flashbacks viewers see about her, such as her profession as a clinical psychologist and her stay at a mental institution.

When she learned she had awarded the role, she was excited since she was a fan of the show and moved with her twin daughters from Los Angeles to Hawaii where Lost is filmed.

[23] Midway through the second season, Watros and Michelle Rodriguez were arrested for driving under the influence in Kailua, Hawaii, in two separate incidents on the same night.

[36] It is revealed in a deleted scene that Libby had been married three times prior to the plane crash and she specializes in marriage counseling.

[citation needed] Theories about unknown aspects of her life exist, including assumptions she was once a DHARMA Initiative employee,[37] an Other,[24] a person planted by Desmond's flashback characters Mrs. Hawking and Brother Campbell.