Wesley Kimmel as Greg Heffley (voice)

Erica Cerra as Susan Heffley (voice)

Christian Convery as Fregley (voice)

Chris Diamantopoulos as Frank (voice)

Hunter Dillon as Rodrick Heffley (voice)

Spencer Howell as Rowley (voice)

Gracen Newton as Manny Heffley (voice)

Gabriel Iglesias as Officer Vasquez (voice)

Ego Nwodim as Officer Leonard (voice)

Lisa Ann Walter as Gabby (voice)

Randy Pearlstein as Mr. Jefferson (voice)

Anthony Parnther as Nutcracker (voice)

Windham Rotunda as Prison Guard (voice)

Jeannette Reyes as Weatherperson (voice)

Will Kinney as Hooligan #1 (voice)

Grant Kinney as Hooligan #2 (voice)

Juliet Donenfeld as Additional Voices (voice)

Johnny Gidcomb as Additional Voices (voice)

Luke Lowe as Additional Voices (voice)

Matt Nolan as Additional Voices (voice)

Lily Oliver as Additional Voices (voice)

Carson Pak as Additional Voices (voice)

Chrystee Pharris as Additional Voices (voice)

Somali Rose as Additional Voices (voice)

Marley Soleil as Additional Voices (voice)

Benjamin Valic as Additional Voices (voice)

Paul-Mikél Williams as Additional Voices (voice)