10 Worst Characters On ER

10. Greg Pratt

It's amazing how many members of County General Hospital die horribly.

Greg Pratt's an arrogant but intelligent member of the team initially. Where Doug Ross' hothead antics often helped patients (and the series' entertainment value), Pratt's were simply loud, aggressive and annoying. His penchant for getting in people's faces wore thin as did his struggle to take orders properly.

There's ultimately a decent character arc for him during his 7 seasons on the show as he matures into a sensible authority figure. Like most of the stars in the later seasons however, Pratt succumbed to ludicrous writing including bizarre crime subplots involving his handicapped adopted brother Leon and a soap operish backstory regarding his estranged father, Charlie.

To top it all off, at a point where he was finally one of the show's more likeable figures, Pratt is blown up by the Turkish mob. No, really. Thanks to yet another criminal character, this time played by guest star Steve Buscemi, Pratt is collateral damage in an ambulance bombing to take the government informant Buscemi out of the picture. It becomes difficult to take Pratt seriously in hindsight after that unceremonious send-off.