— This article is a stub. —
|You can help OK K.O.! Wiki by expanding it.|
- Courtenay Taylor as K.O.
- Ashly Burch as Enid
- Ian Jones-Quartey as Rad / Crinkly Wrinkly / Frat Boi 2
- Robbie Rist as Gnarlio / Frat Boi / Corn Shepard
- Kath Soucie as Peej / Gnarlio Jr.
- Kari Wahlgren as Chill Cat / Tumbles / Mrs. Gnarlio
- One of the cool pests, Gnarlio, bares a resemblance to Mondo Gecko from Teenage Mutant Ninja Turtles. Ironically, both share the same voice actor.