Abby Lockhart, 1999-2008
(Maura Tierney)
Why Best? It was largely due to Nurse Abby Lockhart that ER survived the loss of Mark Greene. The nurse-turned-medical-student-turned-nurse-turned-M.D. was the lovable train wreck that could. When she wasn’t struggling with her alcoholism, she took care of her bipolar mother (Sally Field), her troubled brother (Tom Everett Scott) and later, her prematurely born son Joseph. Never have we been so happy to see someone tie the knot. When Abby finally caught a break, it was well deserved.
KEEP READING: Dr. Paul Sobriki was the worst!