John Watson is a calm 42 old and 5'7 tall man with brown eyes, sandy blonde graying hair and a PhD in medicine. From 2006 to 2010 he served in the Afghanistan war as a military doctor, and was early retired in 2010 due to a gunshot wound to the leg. In 2010, a former classmate introduced him to the analytical, cold and brilliant consulting detective Sherlock Holmes, and Sherlock moved with Sherlock to 221B Baker Street. He's been Sherlock's best friend ever since, and helps him solve cases.