Fans of "ER" are in for an explosive season finale tonight.
Veteran character Steve Buscemi plays a mysterious drunk in final episode of the season.
Getting Buscemi as a guest star was a casting coup for the show, and his character shakes things up even more.
His prescence sets up the finale's cliffhanger, an exploding ambulance filled with several cast members.
"ER" airs tonight at 10:00 on NBC.
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