Noncorporeal aliens inhabit the bodies of Enterprise crew members to study how the crew reacts to a lethal virus infection that has afflicted Trip and Hoshi.
Episode rating
Cast of episode
48
20
15
8
5
3
2
- Cmdr. Charles 'Trip' Tucker III
- Capt. Jonathan Archer
- Ensign Hoshi Sato
- Ensign Travis Mayweather
- Sub-Cmdr. T'Pol
- Dr. Phlox
- Lt. Malcolm Reed
- Ensign Billy
- Ensign Tanner