Brady Noon Greg Heffley (voice) Hunter Dillon Rodrick Heffley (voice) Ethan William Childress Rowley Jefferson (voice) Erica Cerra Susan Heffley (voice) Chris Diamantopoulos Frank Heffley (voice) Ed Asner Grandpa Heffley (voice) Linda Lavin Barb (voice) Loretta Devine Irene (voice) Priscilla Lopez Merle (voice) Jimmy Tatro Bill (voice) Albert Tsai Drew (voice) Hudson Yang Larry (voice) Nathan Arenas Mackie (voice) Vincent Tong Leland (voice) Kimberly Brooks News Anchor (voice) Veena Sood Elevator Lady (voice)