Archer, Reed, and Hoshi are exposed to a highly contagious virus that transforms their bodies, minds, and memories into those of long extinct aliens from a tropical world.
A lonely telepath begs Hoshi to visit his faraway planet in exchange for information on the Xindi, then refuses to allow the linguist to leave.
Kelly accepts Brandon's marriage proposal; David buys a gun to protect himself; Noah's old friend Gwyneth reappears in his life.
With everyone back in school, Carol (Suzanne Somers) decides to take the same college classes as Karen (Angela Watson).
