Notable Guest Stars on "ER" Trivia Quiz

Answer: Dr. Doug Ross

Kirsten Dunst played Charlie, a patient to whom Doug paid special attention, in six episodes during the third season of "ER."

She has since made a name for herself by starring in many movies, including 'Bring It On,' the 'Spiderman' movies, and 'Marie Antoinette.'

Answer: a convenience store

The episode 'The Long Way Around' focused on how the robbery unfolded, with ER nurse Carol Hathaway inside as one of the hostages.

Ewan McGregor has since gone on to be a fixture on the big screen, most notably starring in the newer 'Star Wars' trilogy as Obi-Wan Kenobi.

Answer: He had Alzheimer's disease.

Dr. Lawrence started working in the ER at the beginning of season six as a new attending. It was quickly discovered that he suffered from Alzheimer's Disease, and he was forced to retire from practicing medicine.

Alan Alda is most well-known for his role as Hawkeye Pierce on "M*A*S*H" from 1972 to 1983. He also appeared on 'The West Wing.'

Answer: seventh

The character of Maggie Wyczenski, played by Sally Field, first appears in the season seven episode, 'The Visit.' She appeared in five additional episodes in season seven, in four episodes in season nine, and made a special appearance in season 13, just after Abby gave birth to her son, Joe.

Sally Field is a two-time Academy Award winning actress, most notably for her performance in 'Norma Rae.' She also won an Emmy Award in 2001 for Outstanding Guest Actress in a Drama Series for her appearances on "ER." She began starring in a new television series, "Brothers and Sisters," in 2006.

Answer: He was African-American.

Cheadle's character, med student Paul Nathan, was featured in four episodes in early season nine. He was a non-traditional med student, shown on his surgical rotation under the supervision of Dr. Corday. He struggled with Parkinson's Disease, and as a result, failed his surgical rotation.

Don Cheadle is a well-known actor, famous more recently for his roles in the movies 'Hotel Rwanda' and 'Crash.'

Answer: alcohol

The eleventh season episode, 'Time of Death' featured Ray Liotta as Charlie Metcalf, an alcoholic who comes into the ER. The episode played out on screen in real time (a first for "ER"), and the viewers spent the episode watching the last moments of Charlie's life.

Ray Liotta is an Emmy Award-winning actor, winner of the Outstanding Guest Actor in a Drama Series in 2005 for his role on "ER." He has also appeared in a number of movies, most notably in 'Field of Dreams' and 'Goodfellas.'

Answer: a stroke

Nixon played Ellie Shore, a patient who comes into the ER after suffering a stroke. She cannot speak or communicate in any way with the doctors and nurses in the ER, but can hear and see what is going on around her. For most of the episode, the audience is inside Ellie's head, hearing the thoughts she cannot express.

Cynthia Nixon is a Tony Award and Emmy Award-winning actress, most well-known for her role as Miranda Hobbes on the HBO series "Sex and the City."

Answer: Dr. Greg Pratt

The character of Charlie Pratt (boy, "ER" sure likes to let famous people play characters named 'Charlie') first appeared in the season eleven finale, 'The Show Must Go On,' when his son, Dr. Greg Pratt, shows up at his door. He later appeared in three episodes in season twelve.

Danny Glover is an Emmy-nominated actor who has also appeared in a number of movies, most notably 'The Color Purple' and the 'Lethal Weapon' series.

Answer: Dr. Abby Lockhart

Though Dr. Lennox was treated by all of the listed characters, he had known only Abby before being treated at County. He was one of her former med school professors.

James Woods is an Emmy Award-winning and Academy Award-nominated actor. He began starring in a new television series, CBS's "Shark," in 2006.

Answer: Dr. Luka Kovac

Whitaker played Curtis Ames, a patient treated by Dr. Kovac who later suffered a stroke and some paralysis. He sues Dr. Kovac, and when he loses his case, threatens both Dr. Kovac and Dr. Lockhart (and their son, Joe) before he commits suicide.

Forest Whitaker is an Academy Award-winning actor who has garnered a great deal of success with his role as Idi Amin in the 2006 film, "The Last King of Scotland." He was awarded both a Golden Globe and an Academy Award for this role. He has also appeared on the FX series "The Shield."