"Parallels, Part I"
Somewhere, out there, the Nova-class U.S.S. Vitality sped through space.
"Captain's log, Stardate 57172.33. The Federation has agreed to assist a race called the Thelvons, who've come from a parallel universe, chase down a fugitive from their planet. According to our records, the Thelvons in our universe died out a century ago. We've taken on a Thelvon who I've given a temporary First in Command position to. Her name is Engelina, and over the past few days she has helped to install a trans-dimensional engine known as a quantum drive, in Engineering."