Guest Stars Zehra Fazal voices Violet Harper / Halo Troy Baker voices Brion Markov / Geo Force Grey DeLisle Griffin voices Helga Jace Greg Cipes voices Beast Boy / Garfield Logan Crispin Freeman voices Gregor Markov Nolan North voices Frederick DeLamb / Baron Bedlam Steve Blum voices Henchy Yuri Lowenthal voices Zviad Baazovi Troy Baker voices Simon Ecks Steve Blum voices Count Vertigo Steve Blum voices Wilhelm Peters Whitney Moore voices Coutney Whitmore Yuri Lowenthal voices Plasmus / Otto Von Furth Crispin Freeman as Nikolas Stofka