Gô Mifune (52 episodes, 1967-1968)
Speed Racer / Rex Racer / Additional Voices / James Racer / Racer X (52 episodes, 1967-1968)
Mom Racer / Trixie / Spritle Racer / Additional Voices / Sprytle / Prince Jam / Princess Silvana / Spritle (52 episodes, 1967-1968)
Chim-Chim / Sparky (52 episodes, 1967-1968)
Pops Racer / Additional Voices / Announcer / Inspector Detector / Lionel Racer / Chief Zuma (52 episodes, 1967-1968)
Trixie (52 episodes, 1967-1968)
Gorducho (52 episodes, 1967-1968)
Corredor X (52 episodes, 1967-1968)
Speed Racer (52 episodes, 1967-1968)
Inspetor Detetor (33 episodes, 1967-1968)
Narrador (32 episodes, 1967-1968)
Pops Racer (29 episodes, 1967)
Pops Racer (23 episodes, 1967-1968)
Inspetor Detetor (19 episodes, 1967)
Vozeiros (17 episodes, 1967-1968)
Vozeiros (12 episodes, 1967-1968)
Vozeiros (10 episodes, 1967)
Narrador (10 episodes, 1967)
Vozeiros (8 episodes, 1967-1968)
Vozeiros (7 episodes, 1967-1968)
Vozeiros (6 episodes, 1967-1968)
Vozeiros (4 episodes, 1967-1968)
Narrador (4 episodes, 1967)
Vozeiros (4 episodes, 1967)
Vozeiros (3 episodes, 1967-1968)
Mittchi Shimura #2 (1967-1968) (unknown episodes)
Mittchi Shimura #1 (1967) (unknown episodes)
Ken'ichi Mifune (1967-1968) / Masked Racer (unknown episodes)
Daisuke Mifune (1967-1968) (unknown episodes)
Aya Mifune (1967-1968) (unknown episodes)
Kurio Mifune (1967-1968) (unknown episodes)
Sabu (1967-1968) (unknown episodes)
Inspector Rokugô (1967-1968) (unknown episodes)
Sanpei (1967-1968) (unknown episodes)