Full cast of OK K.O.! Let's Be Heroes

Ashly Burch

Enid (voice) / additional voices (voice)

110 episodes

David Herman

Mr. Gar (voice) / Jethro (voice) / additional voices (voice) / Action News Narrator (voice) / Brandon (voice)

110 episodes

Ian Jones-Quartey

Rad (voice) / Darrell (voice)

109 episodes

Courtenay Taylor

K.O. (voice)

108 episodes

Kate Flannery

Carol (voice)

108 episodes

Jim Cummings

Lord Boxman

108 episodes

SungWon Cho

Johnny / Jack Wacky / Rando (voice) / Teamster / Game (voice)

2 episodes

Ben Jones

A Real Magic Skeleton / A Real Magic Skeleton (voice)

2 episodes

Melissa Villaseñor

Punching Judy / Mega Football Baby / Drupe / Gertie / Ginger / Potato (voice) / Drupe (voice)

2 episodes

Roger Craig Smith

Sonic the Hedgehog

1 episode

Colleen O'Shaughnessey

Miles "Tails" Prower

1 episode

Michael Sinterniklaas

Hero

1 episode

LeVar Burton

Kwame

1 episode

David Coburn

Captain Planet

1 episode

Estelle

Garnet

1 episode

Tara Strong

Ben Tennyson / Raven / Ilana

1 episode

Peter Browngardt

Festro / Uncle Grandpa

1 episode

Michael Dorn

Strike / I.M. Weasel

1 episode

John DiMaggio

Four Arms / Jake the Dog / Shnitzel

1 episode

Jonathan Davis

Succulentus

1 episode

Chris Niosi

Nick Army / Pird

1 episode

Mary Elizabeth McGlynn

Dynamite Watkins (voice)

1 episode

Kali Hawk

Red Action (voice)

1 episode

Cole Sanchez

Colewort (voice) / additional voices (voice)

1 episode

James Urbaniak

Joff (voice)

1 episode