It cast is including:
Tim Curry as Pennywise the Dancing Clown (2 episodes), Richard Thomas as Bill Denbrough (2 episodes), Harry Anderson as Richie Tozier (2 episodes), Dennis Christopher as Eddie Kaspbrak (2 episodes), John Ritter as Ben Hanscom (2 episodes), Richard Masur as Stanley Uris (2 episodes), Annette O'Toole as Beverly Marsh (2 episodes), Tim Reid as Mike Hanlon (2 episodes), Olivia Hussey as Audra Denbrough (2 episodes), Seth Green as Richie Tozier - Age 12 (2 episodes), Jonathan Brandis as Bill Denbrough - Age 12 (2 episodes), Adam Faraizl as Eddie Kaspbrak - Age 12 (2 episodes)