John Buijsman

as Joop

as Don

as Dr. Doolittle

as Pa

as Simon

as Captain SS Rotterdam

as Inspecteur

as Karel

as Karel Groen

as Mr. van Dol

as Vader Alex

as Pooijer

as Arend Valk

as Meneer Visser

as Opa Darius

as Willem

as Opa Jan

as Dr. Doolittle

as Henk van Langeveld

as Nico