NBC said Wednesday that it will air the series finale of its long-running medical drama ER on March 12, 2009. The demise of the show that once dominated the 10 00 p.m. hour was mentioned in passing with a slew of other NBC announcements that included The Office will be have the honor of of following next year's Super Bowl; Celebrity Apprentice will debut on March 1. Kings, which replaces E.R. will debut March 19. Surprising some industry observers, two shows that the network had planned to begin broadcasting around midseason are not mentioned in the company's announcement. Washington Post columnist Lisa de Moraes noted that the show, The Philanthropist and Merlin , may not debut until next season.