Conversation so far:
what episode of er does carol have her babies
Great Expectations is the eighth episode of the sixth season of ER. It has Carol Hathaway going into labor complications while on an El train on Thanksgiving.
when did the er episode great expectations air
The ER episode Great Expectations first aired on NBC on November 25, 1999.

Question: what character was introduced
Self-contained rewrite: what character was introduced in the er episode great expectations