Executive Hawaii Five-0 producer Peter Lenkov revealed a few spoilers about the season 2 premiere in his talk with TV Guide:
"We air on Halloween this year," says executive producer Peter Lenkov, "so we're doing an episode infused with ghost stories." Expect McGarrett to visit spooky cemeteries and sites of ancient human sacrifices. " McGarrett's a believer, but Danny's going to be skeptical."
Hawaii Five-0 season 2 will air on September 19 at 10 p.m. on CBS.