Taliyah Whitaker Greg Heffley (voice) Danica Jones Rowley Jefferson (voice) Kim Syster Rodrick Heffley (voice) Hunter Dillon Susan Heffley (voice) Taylor Schilling Frank Heffley (voice) Katharine McPhee Fregley (voice) Jonathan Higgins Braces Girl (voice) Santino Barnard Teen Driver (voice) Daniel Diemer Homeroom Teacher (voice) Nealla Gordon Mrs. Fregley (voice) Jessica Mikayla Adams Curly-Haired Girl (voice) Brenda Crichlow Charles Davies (voice) Tessa Espinola Mr. Humphreys (voice) Yuvraj Singh Holly Hills’s Friend (voice) Vincent Rodriguez III Joshie (voice) Donny Lucas Random Boy (voice) Jesse Camacho Wizard (voice) Jaime Maclean Hulking Teen (voice) Travis Willingham Teen with Baseball Hat (voice) Gig Morton Girl with Ponytail (voice) John Omohundro Additional Voices (voice)