Anya Taylor-Joy as Marla

Jim Gaffigan as Del (voice)

Gabriel Bateman as Charlie

Adam Lambert as Emperor Maximus (voice)

Kenan Thompson as Bloodbones (voice)

Meghan Trainor as Fairy Godmother (voice)

Daniel Radcliffe as Rex Dasher (voice)

Paloma Rodríguez as Valera (voice)

Maddie Taylor as Glinara (voice)

Lino DiSalvo as Robotitron (voice)

Ryan S. Hill as 6-Year-Old Charlie

Mariah Inger as Police Officer 1

Annakin Slayd as Police Officer 2

Harry Standjofski as Security Guard

Dino Andrade as Scurvy Pete (voice)

Ian James Corlett as Dogsled Driver (voice)

Ben Diskin as Seadog (voice)

Kellen Goff as Salty (voice)

Dan Navarro as Viking Leader (voice)

Tito Ortiz as Royal Guard (voice)

Andrew Pifko as S.K.U.L.L. Scientist (voice)

Cindy Robinson as Nola (voice)

Keith Silverstein as Liam Brooks (voice)

Christopher Corey Smith as Western Outlaw (voice)

Spike Spencer as Various Voices (voice)

Karen Strassman as Dr. Greta Grim (voice)

Kirk Thornton as Ook-Ook (voice)

Kad Merad as (voice) (uncredited)

Franck Dubosc as (voice) (uncredited)

Jenifer as (voice) (uncredited)

Jérôme Commandeur as (voice) (uncredited)