Courtenay Taylor. Actress: OK K.O.! Neue Helden braucht die Welt. Courtenay Taylor is an American actress. She is best known for voicing K.O. in OK K.O.! Neue Helden braucht die Welt (2017) (aside from the pilot and five other episodes, where he was voiced by Stephanie Nadolny instead), Jack in the Mass Effect series of video games, and the female Sole Survivor in Fallout 4 (2015). Among her other roles...