Paul Frees

The Thing, Benjamin J. Grimm, Additional Voices

Gerald Mohr

Mr. Fantastic, Reed Richards, Additional Voices

Jack DeLeon

The Human Torch, Johnny Storm, Mole Man

Jo Ann Pflug

Invisible Girl, Susan Storm Richards

Joseph Sirola

Doctor Doom

Marvin Miller

Gamma Ray, Super Skrull

Hal Smith

Klaw

Don Messick

Kurrgo

Regis Cordic

Diablo

Charles Spidar

Citizen

Vic Perrin

Red Ghost, Doctor Kragoff, Silver Surfer

Henry Corden

Attuma, The Molecule Man

Mike Road

Prince Triton, Additional Voices, Rama Tut

Ted Cassidy

Galactus

Janet Waldo

Princess Pearla

Tol Avery

Warlord Morrat

Ginny Tyler

Princess Anelle

Frank Gerstle

Blastaar