Guerrini 's English proved difficult to understand and his dialogue was dubbed by renowned voice artist Robert Rietty .
Orso Maria Guerrini was the last of four Italian artists employed by the series as per an agreement with RAI , the Italian production company and series financial partner .
Orso Maria Guerrini 's English proved difficult to understand and Orso Maria Guerrini 's dialogue was dubbed by renowned voice artist Robert Rietty .
Orso Maria Guerrini was the last of four Italian artists employed by the series as per an agreement with RAI , the Italian production company and series financial partner .