ER

Ming-Na - Dr. Jing-Mei "Deb" Chen

Though she first appeared as the uptight, over-prepared med student and foil to John Carter's more tentative, wait-and-see approach in Season 1, Deb departed when she mistakenly left a wire inside a patient and decided she wasn't cut out for... more hands-on medicine. But Na returned from Seasons 6-11 as an attending physician who struggled to be a dutiful daughter to her ailing parents. Following her "ER" stints, Na played opposite Charlie Sheen in a multiple-part storyline on CBS's "Two and a Half Men"in 2007 and guest-starred on ABC's "Boston Legal" and "Private Practice" in 2008. She is slated to appear in the cast of the Sci-Fi Channel's "Stargate Universe," which is scheduled to air in October 2009.

(Sara De Boer/Retna Ltd.)