Elenco - O Início do Mundo de Greg: Um Filme Original
Philip Solomon
Craig / Warpspeed (voice)
Noël Wells
Kelsey / Bug Battler / Mortimor / Serena's Friend (voice)
Michael Croner
JP / Kraken Kid / Bryan / Todd / Flag Kid / Serena's Friend (voice)
Vico Ortiz
Serena (voice)
Kimberly Hebert Gregory
Nicole (voice)
Byron Marc Newsome
Duane (voice)
Lucia Cunningham
Jessica (voice)
Phil LaMarr
Bernard / Teach / Waterballoon Mike (voice)
Jeff Trammell
James / Gibson / Cannonball (voice)
Jolie Hoang-Rappaport
Hannah (voice)
Zehra Fazal
Gala / Shannon the Scout / Tattoo (voice)Ben Levin
Bobby / Man on Bike / Tony / Jameolas (voice)Matt Burnett
Frog Master / Pokey / Roger / Monkey Kid (voice)
Jessica McKenna
Handlebarb (voice)
Gunnar Sizemore
Jason / Kah / Boom (voice)
Andree Vermeulen
Eliza / Andy (voice)
Dana Davis
Kit (voice)Najja Porter
Kristenandra / Nessie / Cammy (voice)
Analesa Fisher
The Timekeeper (voice)
Terrence Hardy Jr.
Harry / Norman / Ankles (voice)
Ashleigh Crystal Hairston
Renee / Wren (voice)
Karen Fukuhara
Alexis (voice)