Bill Skarsgard is returning to play Pennywise for the 3rd time. Here's everything we know about 'IT: Welcome to Derry.'

Warner Bros. Pictures

• Bill Skarsgard is returning to play Pennywise in the "IT: Welcome to Derry" series for HBO.
• The prequel is set before the 2017 and 2019 movies.
• Here's what to know about "IT: Welcome to Derry."

Bill Skarsgard will terrify audiences once more as Pennywise the Dancing Clown in a new TV series, "IT: Welcome to Derry."

In 2017, Warner Bros. delivered a terrifying...