Season six will mark the first season to break away completely from author George R.R. Martin's A Song of Ice and Fire book series, so fans who have read the fantasy novels will also be in the dark about what will become of their favourite Thrones characters in the TV series.
The show's creators David Benioff and Dan Weiss pushed for the no-screener policy, which HBO executives eventually agreed to, to help stop Thrones online leaks again.
"It's painful for Dan and David [when leaks happen]," Lombardo said. "When you have press copies, inevitably friends ask, 'Can I see your copy?' There are things that happen. We talked about the upsides and downsides. Some of the press are fans who might be disappointed, but they'll understand."
Game of Thrones returns on Sky's Soho channel on April 25.
- nzherald.co.nz