The HBO Original logo and the title 'BEM-VINDOS A DERRY' followed by ominous dialogue.

The ad opens with the HBO Original logo, then transitions to scenes of people walking, a red truck, and a brick building. It then shows a young woman looking concerned, followed by missing person posters on a brick wall. The screen turns black with text, then shows a tunnel entrance with people walking into it, and a dark, watery tunnel interior with flashlights. The ad features a man in a vest speaking, a man in a jail cell, and close-ups of hands holding. It shows children looking scared, a dark forest scene with a lake, and a swirling, fiery tunnel. The ad concludes with title cards for the series 'IT' and 'BEM-VINDOS A DERRY', along with the premiere date and HBO Max logo.