What is mind merging?
The idea of “mind merging” surfaced in the fifth season. The theory purported that when Sam leaps into someone, remnants of that person’s knowledge or personality could stay behind and influence him. Taking this theory a step further, people on the Quantum Leap newsgroup have even suggested that when Sam leaps into someone, he temporarily has attributes of both bodies. This theory is an attempt to explain why the leapee’s clothes always fit and people always look at him at eye level even though he leaps into people of various heights and builds.