ABBY WON'T LET FAMILY FEUD END YOUNG GIRL'S CHANCE FOR LIFE -- Abby (Maura Tierney) plays with fire when she intercedes on behalf of a sick young girl (guest star Dakota Fanning) who needs a bone marrow transplant -- but the most eligible donor is her half-sister (guest star Julie Marie Berman) whose divorced mother (guest star Sydney Walsh) refuses to okay the procedure out of spite for the girl's father (guest star Steven Flynn) who's her ex-husband. In another family, Dr. Greene (Anthony Edwards) admits his pneumonia-ridden father (guest star John Cullum) into the hospital and shares a rare but memorable father-son moment as the older man's time begins to wind down. Dr. Kovac (Goran Visnjic) gallantly offers to help Nurse Hathaway (Julianna Margulies) buy a used car and they enjoy their spring day on the town. Likewise, a daytripping Dr. Benton (Eriq La Salle) takes Dr. Finch (Michael Michele) out to Los Angeles to visit his toddler son and meet his sister Jackie (guest star Khandi Alexander) who can't help but interrogate her guest. Dr. Carter (Noah Wyle) is tormented by visions of his recent brush with death and draws Dr. Weaver's (Laura Innes) concern upon her return. Alex Kingston, Paul McCrane, Erik Palladino and Ming-Na also star.