Felicity Huffman's introduction on Doc featured a surprising twist about her character - so where does the show go from here? During season 2, episode 2 of the show on Tuesday, September 30, Joan (Huffman) is introduced as Amy's (Molly Parker) former mentor who has elicited mixed reactions from those around her. Amy's loved ones hint that they didn't like how Joan influenced Amy to be so devoted to her career - but it isn't until the end of the episode that viewers get the full picture.