If you’re looking to get in the Halloween spirit, just keep your TV tuned in to ABC. The network — which kicks off its primetime celebration of the holiday Oct. 19 at 8 p.m. with a 50th anniversary airing of It’s the Great Pumpkin, Charlie Brown — has a long history of great Halloween episodes (thank you, Roseanne). But it was in 2010 that the network decided to make it a true tradition for its family sitcoms.