A restaurateur, Mycroft (Rhys Ifans) has attempted, with Joan's assistance, to improve his often-strained relationship with Sherlock. But when Mycroft, also a covert Mi6 agent, faked his own death, Sherlock took that as a personal affront.
Fiona (Betty Gilpin) is a brilliant software engineer. Also the cat-obsessed hacker known as "Mittens," she has assisted Sherlock and Joan. She and Sherlock began a romantic relationship.
After his stint with Mi6, Sherlock returned from London with Kitty (Ophelia Lovibond), his latest apprentice. She and Joan clashed, then bonded. Kitty left after confronting and disfiguring her rapist, fearful of possible arrest.
Dr. Hawes has aided Sherlock and Joan with their cases. He and Sherlock are regular chess partners. After Hawes was almost killed by an explosion in the morgue, he got addicted to drugs, and Sherlock encouraged him to get help.
Sherlock is worried about a medical diagnosis that could affect his sobriety on Elementary. "An Infinite Capacity for Taking Pains" is the first episode of the show's sixth season.
Watson and her sister, Lin, have different reactions when their biological father dies on Elementary. "Once You've Ruled Out God" is the second episode of the show's sixth season.
Holmes and Watson investigate a murder at a Revolutionary War reenactment on Elementary. "Pushing Buttons" is the third episode of the show's sixth season.
Holmes: Why do you suppose you hate your job so much? Watson: I don't hate my job. Holmes: You have two alarm clocks. No one with two alarm clocks loves their job. Two alarm clocks mean it's a chore for you to get up in the morning.
Watson: How do you do it, guess things? Sherlock: I observe and then I deduce. Watson: How did you know I was a doctor, you said you could tell from my hands. Sherlock: Hand, singular. It was soft no calluses. Watson: How did you know my father had an affair? Sherlock: Google. Not everything is deducible.
