Gunnar Sizemore

as Hap McSweeney (voice)

Mark Hamill

as Houlihan (voice)

Kira Kosarin

as Shannon (voice)

Ron Funches

as Sammy (voice)

Flula Borg

as Reggie (voice)

Piotr Michael

as Narrator

Edie McClurg

as Miss Doris (voice)

Mick Wingert

as Pappy/Security Guard (voice)

Eric Bauza

as Gnome Kids/Ken The Business Gnome (voice)

Kari Wahlgren

as Ma/Magic Phone/Princess (voice)

Matthew Moy

as Security Gnome (voice)