Chris Diamantopoulos Frank Heffley (voice)
Hunter Dillon Rodrick Heffley (voice)
Erica Cerra Susan Heffley (voice)
Grey DeLisle Organ Lady (voice)
Hope Levy Additional Voices (voice)
Jabari Banks Lenwood (voice)
Punam Patel Mrs. Winsky (voice)
Ashley London Additional Voices (voice)
Matt Nolan Additional Voices (voice)
Sanjay Rao Mr. Gupta (voice)
Susan Leslie Additional Voices (voice)
Bashir Salahuddin Mr. Warren (voice)
Talon Warburton Narrator (voice)
John Paesano Original Music Composer
Jill Basey Mrs. Canfield (voice)
Randy Pearlstein Mr. Jefferson (voice)
Aaron D. Harris Greg Heffley (voice)
William Stanford Davis Troopmaster Barrett (voice)
Jeff Kinney Book, Producer, Screenplay
Kyrie McAlpin Additional Voices (voice)
Eddie Martinez Gruff Neighbor (voice)
Lex Lang Additional Voices (voice)
Matt Danner Additional Voices (voice), Director
P.L. Brown Priest (voice)
Gracen Newton Manny Heffley (voice)
Dashiell McGaha-Schletter Ricky Fisher (voice)
Johnny Gidcomb Additional Voices (voice)
Richard Grieve Executive Producer
Camden Coley Additional Voices (voice)
Anders Garrett Additional Voices (voice)
Tina Chow Executive Producer
Ayush Rajmachikar Additional Voices (voice)
Sawyer Holt Additional Voices (voice)
Adam Hochstatter Original Music Composer
Sawyer Cole Additional Voices (voice)
Jen Cain Additional Voices (voice)
Arya Dormiani Additional Voices (voice)
Jude Zarzaur Rowley Jefferson (voice)
Kendrick Owen White Additional Voices (voice)
Aaron Hardy Additional Voices (voice)
Damon Fung Additional Voices (voice)
Ellis Myers Fregley (voice)
Shiloh Phillips Additional Voices (voice)
Abhiram Gulati Chirag (voice)
Lila Bahng Patty (voice)
Enzo Valdez Mikey (voice)
Annika Erickson Kindergarten Mom (voice)
Luther Vue Oversized 4 Year Old (voice)
Miabella Rose Additional Voices (voice)
Tunde Oyeneyin Fitness Instructor (voice)
Melrose Additional Voices (voice)
Kyrie Neriah Kennedy Weston (voice)
Livingston McConaughey Student (voice)