OK K.O.! Let's Be Heroes in: A Night at Monstervania

'OK K.O.! Let's Be Heroes in: A Night at Monstervania' is a half-hour ''OK K.O.! Let's Be Heroes'' Halloween special.

Summary
K.O., Radicles and Enid go to Monstervania to find monsters living in Monstervania. Rad and his new girlfriend, Aranea, who is a spider are kid napped and under the influence of Viola, an evil witch and K.O. and Enid must save Rad and Aranea!

Cast

 * Courtenay Taylor as KO
 * Ian Jones-Quartey as Radicles
 * Ashly Burch as Enid; Ms. Mummy
 * Hynden Walch as Aranea Webb
 * Linda Cardellini as Countess Fangille
 * Caleel Harris as William Wolff
 * Joshua Rush as Phillip Geist
 * Kate Higgins as Nefertina
 * Maurice LaMarche as Vincent Frankerstein
 * John DiMaggio as Frankerstein's Monster
 * Lara Jill Miller as Bride of Frankerstein's Monster
 * Greg Cipes as Billy Lagoon
 * Debi Derryberry as Hailey Hissss (a cute snake girl and Aranea's friend)
 * Candi Milo as Viola (an evil witch)
 * Ginnifer Goodwin as Abominablina (a Yeti)
 * AJ Michalka as Sireen (a siren with light purple skin, turquoise eyes and webbed ears)
 * Richard Steven Horvitz as Zombers
 * Kyla Pratt as Medusa
 * Kali Troy as Stheno
 * T'Keyah Crystal Keymah as Euryale