Brady Noon as Greg Heffley (voice)

Ethan William Childress as Rowley Jefferson (voice)

Hunter Dillon as Rodrick Heffley (voice)

Erica Cerra as Susan Heffley (voice)

Chris Diamantopoulos as Frank Heffley (voice)

Gracen Newton as Manny (voice)

Christian Convery as Fregley (voice)

Jessica Mikayla Adams as Braces Girl (voice)

Cyrus Arnold as Teen Driver (voice)

Braxton Baker as Teen with Mullet (voice)

Lossen Chambers as Homeroom Teacher (voice)

Brenda Crichlow as Mrs. Fregley (voice)

Tessa Espinola as Curly-Haired Girl (voice)

Yuvraj Kalsi as Charlie Davies (voice)

Billy Lopez as Mr. Underwood (voice)

Donny Lucas as Mr. Humphreys (voice)

Veda Maharaj as Chirag Gupta (voice)

Jaime Maclean as Holly Hills’s Friend (voice)

Robert Moloney as Joshie (voice)

Gig Morton as Random Boy (voice)

Mizinga Mwinga as Wizard (voice)

John Omohundro as Hulking Teen (voice)

Zeno Robinson as Teen with Baseball Hat (voice)

Gracyn Shinyei as Girl with Ponytail (voice)

Áine Sunderland as Blonde-Haired Girl (voice)

Jen Cain as Additional Voices (voice)

Tristan Allerick Chen as Additional Voices (voice)

Jordyn Curet as Additional Voices (voice)

Johnny Gidcomb as Additional Voices (voice)

Caleb Jeon as Additional Voices (voice)

Ava Mae Leslie as Additional Voices (voice)

Susan Leslie as Additional Voices (voice)

Iara Nemirovsky as Additional Voices (voice)

Matt Nolan as Additional Voices (voice)

Andre Robinson as Additional Voices (voice)

Carter Sand as Additional Voices (voice)

Lily Rose Silver as Additional Voices (voice)

Brooke D. Singleton as Additional Voices (voice)

Jason Grant Smith as Additional Voices (voice)

Benjamin Valic as Additional Voices (voice)

ViviAnn Yee as Additional Voices (voice)

Julian Zane as Additional Voices (voice)