The first episode will be broadcast on HBO in the US on Sunday 6 April at 9pm Eastern Time, meaning it will air in the UK at 2am on Monday 7 April.The episode will also still be shown at 9pm on Monday as usual.The fantasy series is partly filmed in Northern Ireland with local spots including Shane's Castle, near Randalstown and Ballintoy harbour having made their way onto the small screen in previous episodes.As part of the Belfast Film Festival a select number of local fans have been invited to a special screening of the first episode 11 days before its world television premiere.The series four simulcast was announced at a screening in London on Tuesday, where the stars of the show arrived on the red carpet.Speaking about the new series, Sophie Turner, who plays Sansa Stark, said: "The great thing about Game Of Thrones is it's going more away from the books as we go on, so it's all very hush-hush secret. We really have no idea what's going to happen."There are a lot of shocks consistently the whole way through this season."It always keeps you on your toes, that's what Game Of Thrones does, but usually you have that ninth episode peak - this season is on a high the whole time."Scottish actor Iain Glen, who plays lead character Daenerys Targaryen's (Emilia Clarke) bodyguard Jorah Mormont added: "It's always exciting, I love reading (the scripts)."He admitted to feeling nervous about whether his character would join the long list of those brutally killed off: "A little bit, but people tell me I'm still alive..."Turner agreed: "Everyone gets really worried, but we're all so selfish, like: 'Are you going to die?' We do go up to the writers and say: 'Am I going to die this season? Can you just let me know before you send out the script?'"Other stars of the TV series who joined the red carpet included Rose Leslie (Ygritte), Liam Cunningham (Davos Seaworth), John Bradley (Samwell Tarly) and Gemma Whelan (Yara Greyjoy).