premise: Niamh Wilson ( born March 9, 1997) is a Canadian film and television actress from Oakville, Ontario, known for her role as Corbett in Saw III, reprised in Saw V; the Canadian horror film "The Marsh" (2006); and the title role in the Family Channel series "Debra!"
hypothesis: Niamh Wilson's 1st title role was in the Family Channel series "Debra"
reason: She played the title role in the Family Channel series "Debra" and other movies but it doesn't state which one was her first title role.