Transcript for 'Game of Thrones' is back, here's what went down during last night's season premiere
And on that note, another pop headline. Epic "Game of thrones," will reeve got stuck in Chicago because of the weather. We sent him there to watch with superfans. Good morning. Reporter: Hello. Yeah. Winter came to Chicago. Almost 5 inches of snow here yesterday, but that's fitting for a "Game of thrones" Sunday as the eighth and final season kicked off. Fans around this city, around the world really coming together to celebrate this massive show, one of the biggest TV events in history. Lots of predictions from people about who is going to take the iron throne, and a lot of clues in that first episode, but don't worry. No spoilers here. Winter is coming. Reporter: Winter is finally here. After an 18-month wait, "Game of thrones" returning to TV for its final season. Anticipation sky high throughout the night. All top ten of the worldwide Twitter trends related to the premiere. By the thousands, fans gathering for watch parties like this one in Chicago. Costumes and set displays, setting the tone fit for the seven kingdoms. We debated staying home, but it was cool to have, like, a community of people. It's so epic. It's so cinematic for a television show, I don't think we have had that before. Reporter: And those who weren't deemed to take it seriously enough, even locked out. Chrissy Teigen chronicling her own husband John legend shutting her out of his own party for talking too much. What are you guys doing? Reporter: There was no expense spared for the show's last hurt ra. Costs for season eight reportedly $15 million per by all accounts, it was worth it. I'm very emotional right now. Reporter: The first episode bringing wait. No spoilers here, but there were a lot of dragons. And as millions of fans were in front of their TV sets, many saying they were experiencing a blackout. HBO servers reportedly going down, setting Twitter on fire. Fans outraged, tweeting at HBO's streaming service. One user writing, HBO Go, you had two solid years to figure this out. HBO telling ABC news, quote, we are experiencing no issues with our services. Since its debut eight years ago, "Game of thrones" has grown into an inescapable cultural fe no, ma'am -- phenomenon. Critics and cast members nearing the journey together. One central question remains, that we put to Pedro Pascal who starred in a past season. Who is going to take the iron throne? They're all going to die. When you play the game of thrones, you win or you die. Reporter: Some of the most diehard "Game of thrones" fans are betting on who will take the iron throne. Some even filling out a March Madness kind of bracket, making predictions. Bran stark, right now, the odds on favorite, but as we know with "Game of thrones," it's anyone's game, George. It sure is, will. Thanks very much.
This transcript has been automatically generated and may not be 100% accurate.