Steve Buscemi will make an appearance on ER’s 14th season finale, airing May 15 says TV Guide. Buscemi plays “a loudmouthed drunk with a dangerous secret.” And he will “threaten the safety” of the hospital staff and make Pratt “choose between the life of a patient or the lives of his staff.” Elsewhere in the season-ender, Moretti (Stanley Tucci) makes a return visit, as does Hal Holbrook - who apperas in this week’s episode.