Wesley Kimmel Greg Heffley (voice) Erica Cerra Susan Heffley (voice) Christian Convery Fregley (voice) Chris Diamantopoulos Frank (voice) Hunter Dillon Rodrick Heffley (voice) Gabriel Iglesias Officer Vasquez (voice) Ego Nwodim Officer Leonard (voice) Lisa Ann Walter Gabby (voice) Anthony Parnther Nutcracker (voice) Windham Rotunda Prison Guard (voice) Juliet Donenfeld Additional Voices (voice) Johnny Gidcomb Additional Voices (voice) Luke Lowe Additional Voices (voice) Matt Nolan Additional Voices (voice) Chrystee Pharris Additional Voices (voice) Somali Rose Additional Voices (voice) Benjamin Valic Additional Voices (voice)