Dr. Andrew Cook
Dr. Andrew Cook was brought to Colorado Springs from Boston by Michaela's Mother to help with the birth of Katie. Michaela, however, ended up giving birth in the woods with only Sully there to help.
Andrew then took over Dr. Mike's practice while she adjusted to the rigors of being a new mother and a professional. In Dr. Mike's absence, Horace had an attack of gallstones and developed an infection. Andrew then performed his first solo surgery -- with Colleen's assistance.
Dr. Cook agrees to accept Preston's offer to be resident physician for the heath spa. Andrew seems to be quite smitten with Colleen and a romance appears to be blossoming.