Russell
Rod Stool (16 episodes)
Grandpaw / Manhole Dog (voice) (74 episodes)
Balloon Vendor
CC Glendale (1 episode)
Byron Kane (1 episode)
Older Felix
Roy (voice) (103 episodes)
Gil / Manny (voice)
Mr. Second Chance (voice) (7 episodes)
Gil / Manny (voice) (103 episodes)
Duke Peel (voice) (1 episode)
Mr. Kerdle (voice) (4 episodes)
Judd Lumpkin
Frank Kanaskie (19 episodes)
Dr. Fraser Healy (13 episodes)
Nancy Siebolski (13 episodes)
Uncle EP Leacock
Victor
Nestor (voice) (104 episodes)
Professor Pamplemoose (voice) (104 episodes)
Jim Fenton
Detective Hamish Slorach (2 episodes)
Two Legs Joe (voice) (52 episodes)
Robert (voice) (1 episode)
Hank Kringle
Buddy (voice) (52 episodes)
Additional Voices (voice) (26 episodes)
Mr. Rutabaga (26 episodes)
Robear (voice) (52 episodes)
Lieber
Dr. Gavin Brookes (1 episode)
Dr. Julius Booker (1 episode)
Louis Owen
Milo 55160
Charlie Cowell
Jay Felger (2 episodes)
Harold Green
Duncan
Darren
Dr. Seigel (1 episode)
Gary Hargrave
Gary Hargrave
Lab Technician
Supervisor
Marty Stephens (83 episodes)
Gary Redfield (1 episode)
Umberto Ortega
Umberto Ortega (1 episode)
TV Reporter
Billy the Club Manager (2 episodes)
Harold Green (304 episodes)
Barry Berlin (uncredited) (1 episode)