1. When Dr. Ross saved a kid during a flood:
2. When Dr. Carter got stabbed by a patient, fell to the ground, and saw Lucy, who had been stabbed as well:
3. When Dr. Ross left Chicago for Seattle:
4. When Dr. Greene finished his last shift at County General:
5. Carter reading Dr. Greene's letter to the staff, then learning that he had died:
6. When Dr. Romano used sign language to interact with Dr. Benton's son behind his back:
7. When Dr. Robert Romano lost an arm:
8. When Dr. Romano got crushed to death by a helicopter:
9. When Carol and Doug reunited in Seattle:
10. When Hathaway and Ross returned during the show's final season:
11. When Ray Barnett lost his legs after being hit by a truck:
12. When it looked like Luka Kovac was going to be killed by rebels in Africa, but he began praying and it saved his life:
13. When Kovac forgave Abby and they agreed to start a life together somewhere else:
14. When Neela watched the video Gallant left for her in the event that he died:
15. When Dr. Pratt initially survived the ambulance explosion, then died in the hospital:
16. When Dr. Carter called Rachel "Dr. Greene."
17. When the final shot of the series showed County General Hospital one last time:
CORRECTION
Hathaway and Ross reunited on the Season 15 episode "Old Times." A previous version of this post misidentified the episode and Hathaway's title.