Karen Neill
 (real name Nell Balaban) is the actress that supplies the voice for Karai in the 2003 cartoon, Fast Forward, Turtles Forever, Teenage Mutant Ninja Turtles Smash-Up, and all related media. She also voiced Tang Shen in the 2003 cartoon.

Her most prominent roles outside of TMNT are that of Nefeltari Vivi in the 4Kids dub of One Piece and Ishizu Ishtar in Yu-Gi-Oh!.