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