Tom Hanks and Emily Blunt will take to the stage to host episodes of "Saturday Night Live" in October. Blunt, who is promoting her newest film "Girl on the Train," will host the October 15 episode. This will be the British actress's SNL debut. Bruno Mars, who has previously appeared 3 times on the show, will join her as the evening's musical guest. Hanks will host the October 22nd episode. This will be the academy award winning actor's 9th appearance on SNL. Pop star Lady Gaga will join him, making her third appearance on the sketch comedy show.