Inspector Gadget / Chief Quimby (and in segments "The Capeman Cometh"

Dr. Claw / Brain / M.A.D Cat / Dr. Noodleman (segment "Gadget's Gadgets") / M.A.D Agent (segment "The Capeman Cometh")

Penny

Penny (segment "Gadget's Gadgets" and "The Capeman Cometh")

Cpl. Capeman (segments "The Capeman Cometh" and "Gadget's Gadgets")

Inspector Gadget (segments "The Capeman Cometh" / "Prince of the Gypsies" / "Gadget's Gadgets")

Ballah (segment "Prince of the Gypsies")

Vespella (segment "Prince of the Gypsies")

M.A.D Agent (segment "Prince of the Gypsies")

M.A.D Ninja (segment "The Capeman Cometh")

M.A.D Agents (segments "The Capeman Cometh" & "Gadget's Gadgets")

M.A.D Nurse (segment "Gadget's Gadgets")