When the U.S.S. Enterprise discovers a severely injured humanoid in the wreckage of an escape pod, Geordi volunteers to have his nervous system hooked up to the stranger's, in order to stabilize him. During the process, a wave of visible energy is transmitted from the humanoid to Geordi. Dr. Crusher holds little hope for the recovery of the patient she has dubbed 'John Doe', but he soon begins to exhibit amazing recuperative powers. While his damaged tissue is repairing itself at a remarkable rate, 'John's' undamaged cells are mutating in a manner incomprehensible to the doctor.
