. De Letterkoekjesbrief: Part Con Margreet Roelfsema, Mario Perton, Sven De Ridder, Alexander van Heteren. All of the four are almost suspended until Guusje lies it was all her fault. De pietenacademie: Con Manon Franken, Juan Gerlo. Guusje, Jaap and Tony try to find their way out of the labyrinth with outer help from Jacobientje. Swingpiet, Bakpiet, Ruiterpiet and saint Nicolas are trapped in. When Wout gives another riddle the Pieten come. Once there saint Nicolas explains the four might become the su Leer todoJacobientje, Guusje, Tony and Jaap get busted by Hoofdpiet on their way to the secret. Series Cast (52) · Fred van der Hilst · Alexander van Heteren · Margreet Roelfsema · Mario Perton · Manon Franken · Juan Gerlo · Sven De Ridder · Bas van Prooijen. By stealing the security key. When Lachpiet makes dinner for the campers three. De Pietenacademie: Part Con Manon Franken, Margreet Roelfsema, Mario Perton, Juan Gerlo. De Pietenacademie: Part 7: Dirigido por Klaus Verscheure. Tony. A helicopter, the colossal steamboat and a submarine - all with complete crew - are send out to find Swingpiet, Bakpiet, Ruiterpiet and saint Nicolas. Smartpiet confronts Lachpiet with the disappearance of. When Lachpiet finds out Guusje got in trouble he confronts the saint with the truth. Con Don van Dijke, Manon Franken, Margreet Roelfsema, Mario Perton. Lachpiet is the only teacher to go on boot camp with the students, much to the reluctance of the four friends.