Freddie Highmore

Arthur Montgomery

Madonna

Princess Selenia (voice)

Mia Farrow

Daisy Suchot

Adam LeFevre

Davido

Doug Rand

Arthur's Father

Penny Balfour

Rose Montgomery

Ron Crawford

Archibald Suchot

David Bowie

Maltazard (voice)

David Suchet

Narrator (voice)

Robert De Niro

King (voice)

Snoop Dogg

Max (voice)

Jean Bejote Njamba

Chief Matassalai (voice)