Question: When was the 8th season of the show premiered in which Samantha Jo "Mandy" Moore have appeared and  which is an American television reality program and dance competition airing on the Fox network?
Sentence (from "So You Think You Can Dance (U.S. season 8)"): Also returning is the selection of a Top 20 for the finals, in contrast to season 7's Top 11.
Relevant evidence: No