- Blue bulging thick veins all over their bodies
- Fingers & toes would fuse together; form three digits
- Sensitive to light
- Become invisible, ultraviolet light made them visible
- Virus transforms the host's DNA into Tarchanne DNA
- Could be undone if caught early
- 2360s: Federation established a colony on Tarchannen III
- 2362: Colonists disappeared, USS Victory investigated, found nothing
- 2367: Crew members of the Victory transformed into Tarchanne
- Most returned to Tarchannen III, 2 were cured
