Bill Denbrough is played by Jonathan Brandis [from Stepfather 2, Sidekicks, The Neverending Story II, Ladybugs, The Flash and Seaquest DSV] as a kid, and as an adult by Richard Thomas [from Battle Beyond The Stars, The Outer Limits and Just Cause].
Bill is more or less the leader of The Losers Club. It's his brother's death that pushes him to stop IT. And the rest of them look up to him and follow his lead. IT sometimes appeared to Bill as Pennywise, but IT also liked to take the shape of Georgie. Using his dead brother against him to really mess with him. You can explore the rest of InfiniteCoolness.com using the links at the top of the page, and if you're looking for a picture that's not here, try posting a request on the board. Thanks for stopping by!