A surreal, swirling Victorian machine made of glowing gears, brass pipes, and intricate clockwork, floating in a dark, misty void, with faint, ghostly faces emerging from the steam.
Welcome to Derry Episode 4: "The Great Swirling Apparatus of Our Planet's Function"
IT: Welcome to Derry Episode 4, titled "The Great Swirling Apparatus of Our Planet's Function," premieres on Sunday, November 16, 2025, at 9:00 PM ET/PT on HBO and will be available for streaming on Max. This marks the midpoint of the eight-episode season, which continues to explore the dark history of Derry, Maine, setting the stage for the events depicted in Stephen King's original "IT" story.
Episode Details and Release Schedule
The series follows a weekly release pattern, with Episode 4 airing as part of the regular Sunday night lineup. The complete season consists of eight episodes, with the finale scheduled for December 14, 2025. Viewers can catch the episode through the following platforms:
- United States: HBO and Max at 9:00 PM ET/PT
- United Kingdom: Sky and NOW at 9:00 PM GMT
- Chris Chalk
- Jovan Adepo
- Taylour Paige
- James Remar
- Madeleine Stowe
- Stephen Rider
- Rudy Mancuso
- Blake Cameron James
- Amanda Christine
- Matilda Lawler
- Arian S. Cartaya
- Clara Stack
- Deeper insights into Derry's dark history
- Further exploration of Pennywise's origins and motivations
- Continued character arcs for the town's residents
- Building tension leading toward the season's climax
Plot and Story Development
Set in the 1960s, "Welcome to Derry" delves into the sinister events that have plagued the town for generations. Episode 4 continues to build upon the psychological horror elements established in previous episodes, with expectations running high for revelations about Pennywise's origins and the deepening terror gripping the community.
The episode's intriguing title, "The Great Swirling Apparatus of Our Planet's Function," suggests a deeper exploration of the cosmic horror elements inherent in Stephen King's mythology, potentially touching upon the larger forces at play in Derry's supernatural landscape.
Cast and Characters
Bill Skarsgård reprises his iconic role as Pennywise the Dancing Clown, bringing his chilling portrayal back to the screen. The ensemble cast includes:
What to Expect
As the series reaches its midpoint, Episode 4 promises to intensify the narrative, blending character development with spine-tingling horror moments. Viewers can anticipate:
The episode is positioned to maintain the series' momentum, keeping audiences engaged with the unfolding mystery of what makes Derry such a uniquely terrifying place in the Stephen King universe.
The prompt for this was: welcome to derry episode 4
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