Danielle Wade (Cady Heron), Mariah Rose Faith (Regina George), Megan Masako Haley (Gretchen Wieners), Jonalyn Saxer (Karen Smith), Mary Kate Morrissey (Janis Sarkisian), Eric Huffman (Damian Hubbard), Adante Carter (Aaron Samuels), David Wright Jr (u/s Kevin Gnapoor), Gaelen Gilliland (Mrs. Heron/Ms. Norbury/Mrs. George), Lawrence Street (Principal Duvall), Will Branner (Mr. Heron), Will Branner (Coach Carr/Glen Coco/Math Moderator), Sarah Crane (Dawn Schweitzer), Sydney Mei Ruf-Wong (Lizzie Therman/Caroline Krafft), Sky Flaherty (Tyler Kimble), DeShawn Bowens (Christian Wiggins), Blake Zelesnikar (Shane Oman), Brittany Conigatti (s/w Sophie Kawachi), Mary Beth Donahoe (Caitlyn Caussin), Samuel Gerber (s/w Jason Weems), Fernell Hogan (Marwan Jitla), Olivia Renteria (Taylor Wedell), Morgan Ashley Bryant (Rachel Hamilton), Kaitlyn Louise Smith (Sonja Acquino)