Bill Skarsgard in 'IT: Welcome to Derry' Brooke Palmer/HBO Share on Facebook Share on X Share to Flipboard Send an Email Show additional share options Share on LinkedIn Share on Pinterest Share on Reddit Share on Tumblr Share on Whats App Print the Article Post a Comment The premiere of IT: Welcome to Derry enticed a lot of viewers back into Pennywise's clutches. The HBO series debuted to 5.7 million cross-platform viewers (measured over three days), making Welcome to Derry the third biggest series debut in HBO's history.