IT: Welcome to Derry's premiere pulled in 5.7 million viewers, making it HBO's third-best series debut behind House of the Dragon and The Last of Us

New IT prequel series IT: Welcome to Derry is not only breaking records within the killer clown franchise, but is fast becoming one of HBO's most successful shows.The first episode of IT: Welcome to Derry, which premiered on October 26, managed to pull in 5.7 million US viewers in its first three days, according to Warner Bros. Discovery, combining views from both the network channel HBO and the streaming service HBO Max.This puts the IT: Welcome to Derry series debut in HBO's top three in the h