Final Appearance: Sphere Builders, The Xindi
Mission Date: Febuary 14, 2154
While trying to destroy the sphere, everyone's skin begins to break down except for Phlox's. In the episode "Doctor's Orders", it is shown that transdimensional disturbances affect Denobulans much more slowly than Humans or Vulcans.
T'Pol reveals that she is 65 years old.
In this episode, it is revealed that the founding members of the Federation are Humans, Vulcans, Andorians and Tellerites.
Goof: In her log entry near the end T'Pol gives the year 2152 but the year is 2154
Goof: When the Reptilians scan Degra's ship as it approaches, they say there are seven human lifesigns on board. That number is incorrect - Archer, Hoshi, Reed and three MACOs are all that are aboard. The Reptilians should pick up six human lifesigns.
Goof: The German bunker belongs to its Army, but the flag on the ceiling is from the German Navy.
Shran: And tell Archer we're not even any more! He owes me!
The ending of this episode is similar to Scott Bakula's other series Quantum Leap where at the end of each episode he's in another time and place not sure where or when he is.
With this episode, Enterprise's third season becomes the first season of any Star Trek series without any appearances of the Klingons.