Sinterklaas en het Geheim van de Robijn

The planned marriage between Premierpiet and Probleempiet is in jeopardy, scholars Hans and Frans Steenstra have been kidnapped, and a rare ruby has been stolen from the Rijksmuseum. The dangerous Dr. Brein is behind all of this. Sinterklaas must intervene and even sends his Pieten on a trip to Switzerland to prevent Dr. Brein's criminal organization from gaining power.

• Martijn van NellestijnWriter
• Martijn van NellestijnDirector

• Jos BrinkMuseum Directeur
• Ricardo de GrootDonnie Bianco
• Richard de RuijterBoris
• Bart EttekovenSluwe Ruudje
• Sander FaasHans Steenstra
• Hetty HeytingTante Til
• Liane HoudijkPittige Pia
• Patrick KerklaanPatserpiet 1
• Hans KlokBisschop van Zwitserland
• Kenneth MacCayPrincipe Piet
• Ingeborg MastProbleempiet
• Bea MeulmanMarja, Assistent museumdirecteur