Matthew Lillard

Shaggy Rogers (voice) / Shaggy (voice)

Dean Boland

Rowby Canton

Jack

Ken Diebold

Shaggy Rogers / Little Boy (voice) / Shaggy Rogers / Logan's Friend #1 (voice)

Principal Grayle

Larry

Shaggy (voice)

Stevo

Tim LaFlour

Shaggy (voice)

Shaggy (voice)

Lance Durand

Lt. Todd 'Maniac' Marshall

Shaggy Rogers (voice)

Shaggy Rogers (voice)

Shaggy Rogers (voice)

Shaggy Rogers / Shaky Joe (voice)

Billy Brubaker

Shaggy (voice)

Shaggy (voice)

Shaggy Rogers (voice)

Shaggy / Craggly / Captain Cutler (voice)

Phallicyte Executive (uncredited)

Matthew Lillard

Shaggy (voice)

Shaggy Rogers (voice)

Daniel Frye

Shaggy Rogers (voice)

Shaggy Rogers (voice)

Shaggy Rogers (voice)

Eric

Stork

Luc Fromage

Dr. Jason Burr (voice)

Nathan

Shaggy Rogers (voice)

Roger Sperling

Young Couple

Tim

Roscoe Devine

Longaville

Desmond 'Dez' Howard

Fishman

Spaceman

Joel Brandt

Shaggy (voice)

Ned (voice)

Psychologist (Voice)

Norville 'Shaggy' Rogers / Self - Voice of "Shaggy"

Bernie Wexler

Dogcatcher (voice)

Chip (Slashtronaut) (voice)

Gus Lafarge

Joey

Sal

Jason

Crocket

Mailman Gus (voice)

Tim

Shaggy Rogers (voice)

Herman Spooner

Doug Van Housen

Jack

Adam Ginesberg

(voice)

Matthew McQueen

Gus

Allister Goldfang

Wink Chessman (voice)

Alan Mackey

Monsieur Ducat (voice)

Monsieur Ducat (voice)

Dennis Glenn

Vashon Dumiete / Self / Simeon Freewalk / Ren 'Stick' Casawary / Bixby Silver / Self - DM / Purple Worm / William Smallwood / Wishing Well Fairy Godperson / The Portal

Shaggy Rogers (voice)