Dr. Leonard "Bones" McCoy

In the alternate reality created by the temporal incursion of 2233, Dr. Leonard McCoy was directly responsible for getting his friend Jim Kirk stationed on the Enterprise. McCoy's quick thinking left Kirk infected with symptoms mimicking a disease that would require continued treatment under his doctors supervision. Like Kirk's quick ascent to captain, McCoy also accepted a field promotion when the medical officer died during the incident with the Romulan Nero. Although often caught between opposing orders of Kirk and Spock, McCoy continued to serve on the Enterprise beyond its first mission. A year later, he made the ground breaking discovery that the blood of genetically engineered Kahn Noonien Singh had regenerative properties, a fact that saved his captain.