“Saturday Night Live Presents: A Very Gilly Christmas” (8 p.m., NBC): The impish and

“Saturday Night Live Presents: A Very Gilly Christmas” (8 p.m., NBC): The impish and malicious Gilly (Kristen Wiig) might not be an obvious choice to host a holiday-themed special, but we’ll go along with the joke. She’ll preside over two hours of fresh sketches and highlights of old classics.