9-1-1 has featured numerous different romantic pairings over the course of its eight seasons, but perhaps its most controversial relationship comes from season 1 — Evan "Buck" Buckley and Abby Clark. The two 9-1-1 characters shared an age difference significant enough to raise a few eyebrows. Of course, other problems arose between Buck and Abby that turned people off towards their relationship, meaning there are different reasons why some fans were opposed to them being together.