Patrick McKenna

as Russell

as Rod Stool

as Grandpaw / Manhole Dog (voice)

as Balloon Vendor

as Older Felix

as Roy (voice)

as Byron Kane

as CC Glendale

as Gil/Manny (voice)

as Gil / Manny (voice)

as Mr. Second Chance (voice)

as Gil / Manny (voice)

as Mr. Kerdle (voice)

as Judd Lumpkin

as Frank Kanaskie

as Dr. Fraser Healy

as Nancy Siebolski

as Duke Peel (voice)

as Barry

as Ben

as Uncle EP Leacock

as Victor

as Nestor (voice)

as Professor Pamplemoose (voice)

as Jim Fenton

as Two Legs Joe (voice)

as Robert (voice)

as Hank Kringle

as Harold Green

as Buddy (voice)

as Sam

as Additional Voices (voice)

as Detective Hamish Slorach

as Mr. Rutabaga

as Robear (voice)

as Rivet

as Lieber

as Dr. Julius Booker

as Louis Owen

as Milo 55160

as Dr. Gavin Brookes

as Charlie Cowell

as Harold Green

as Duncan

as Darren

as Harold Green

as Gary Hargrave

as Lab Technician

as Mr. Geiger

as Roger

as Supervisor

as Jay Felger

as Marty Stephens

as Dr. Seigel

as Gary Redfield

as Umberto Ortega

as Umberto Ortega

as TV Reporter

as Snyder

as Billy the Club Manager

as Harold Green

as TV Man

as Barry Berlin (uncredited)