- Brandon Crane - Ben Hanscom - Age 12
- Adam Faraizl - Eddie Kaspbrak - Age 12
- Seth Green - Richie Tozier - Age 12
- Ben Heller - Stanley Uris - Age 12
- Emily Perkins - Beverly Marsh - Age 12
- Marlon Taylor - Mike Hanlon - Age 12
- Olivia Hussey - Audra Denbrough
- Sheila Moore - Mrs. Kaspbrak
- Jarred Blancard - Henry Bowers - Age 14
- Chris Eastman - Belch
- Gabe Khouth - Patrick
- Michael Ryan - Tom Rogan
- Venus Terzo - Cyndi
- Frank C. Turner - Al Marsh
- Caitlin Hicks - Patti Uris
- Tony Dakota - Georgie Denbrough
- Steven Hilton - Mr. Denbrough
- Sheelah Megill - Sharon Denbrough
- Chelan Simmons - Laurie Anne Winterbarger
- Merrilyn Gann - Mrs. Winterbarger
- Susan Astley - Aunt Jean
- Claire Vardiel - Arlene Hanscom
- Garry Chalk - Coach
- Terence Kelly - Officer Nell
- Donna Peerless - Miss Douglas
- Steve Makaj - Ben's Father
- William B. Davis - Mr. Gedreau
- Michael Cole - Henry Bowers
- Florence Paterson - Mrs. Kersh
- Charles Siegel - Nat
- Kim Kondrashoff - Joey
- Noel Geer - Bradley
- Scott Swanson - Rademacher
- Nicola Cavendish - Desk clerk
- Tom Heaton - Mr. Keene
- Paul Batten - Pharmacist
- Russell Roberts - Greco
- Bill Croft - Koontz
- Boyd Norman - Gas Station Attendant
- Helena Yea - Rose
- Suzie Payne - Female Cabbie
- Megan Leitch - Library Aide
- Laura Harris - Loni (uncredited)
- Jay Brazeau - Derry Cab Driver
- Patrice Leung
- Stephen King
- Victoria Burrows
- Jim Green
- Mark Bacino
- Mark Tillman
- Matthew O'Connor
- John Beal
- Richard Bellis
Tim Curry interpreta a Pennywise en la serie.
Harry Anderson interpreta a Richie Tozier en la serie.
Dennis Christopher interpreta a Eddie Kaspbrak en la serie.
Richard Masur interpreta a Stan Uris en la serie.
Annette O'Toole hace el papel de Beverly Marsh.
Tim Reid interpreta a Mike Hanlon en la serie.
John Ritter hace el papel de Ben Hanscom.
Richard Thomas interpreta a Bill Denbrough en la serie.
Jonathan Brandis hace el papel de Bill Denbrough - Age 12.
Brandon Crane interpreta a Ben Hanscom - Age 12 en la serie.
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