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Guest star Sally Field (pictured) takes centre stage in this episode, when her manic depression spirals out of control.

It's a testament to the show that it consistently attracts actors of such high calibre, who fit so seamlessly into the ensemble.

Tonight, Maggie's erratic behaviour comes to a head, and Abby (Maura Tierney, right) must enlist the help of Luka, Carter and psychiatrist Kim Legapsi.

Benton, still coming to terms with the death of his nephew, has to treat his gang member girlfriend. And Mark and Elizabeth deal with their own demons: Elizabeth attends a traumatic deposition for her malpractice suit, while Mark, still keeping his condition secret, finds circumstances are conspiring against him.

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