Fri'slen
- Vulcan subspecies
- Formed by a contagion resulting from experimentation performed at research outpost in 2135 on Trilan (ENT Novel: Kobayashi Maru)
- Infection spread by intimate sexual contact coupled with blood-to-blood transfer (ENT Novel: Kobayashi Maru)
- Symptoms include general physical mutation, extreme aggression, total loss of emotional control (ENT Novel: Kobayashi Maru)
- Growth of additional vertical nictitating membranes, rows of teeth (ENT Novel: Kobayashi Maru)
- Excessive pinnae growth, pinnae merging with scalp (ENT Novel: Kobayashi Maru)
- Varicose veins across the body (ENT Novel: Kobayashi Maru)
- Increased olfactory sensitivity (ENT Novel: Kobayashi Maru)
- Extreme cravings for animal flesh, emerging as cannibalistic tendencies towards untransformed Vulcans (ENT Novel: Kobayashi Maru)
- Subspecies rendered extinct following military airstrike on Trilan outpost (ENT Novel: Kobayashi Maru)