John Kricfalusi Creator, Producer Billy West Ren Hoek, Stimpson "Stimpy" J. Cat Voice, Writer Phil Hartman Announcer Guest Voice Tommy Davidson Sammy Mantis Guest Voice Alan Young Haggis MacHaggis Guest Voice Jeff Bennett People screaming Voice Mark Hamill Mr. Noggin Guest Voice Charlie Brissette Singer Guest Voice Frank Gorshin The Rev. Jack Cheese Guest Voice Hamilton Camp Voice, Director, Writer, Producer Randy Crenshaw Singer Guest Voice Jack Carter Voice Michael Pataki Cow Voice Billy West Ren Höek Voice June Lockhart Strange Boy Voice Harris Peet Muddy Mudskipper , Jasper Voice Jill Gable Voice Bob Joyce Singer Guest Voice Shawn Patterson Sid Voice Gregg Vanzo Director Steve Loter Director Ken Bruce Director Vince Calandra Writer Ron Hughart Director Chris Reccardi Music, Director Mike Kim Director Jim Gomez Writer Ron Hauge Writer David Lipman Executive Producer Vanessa Coffey Executive Producer Jim Ballantine Producer