Originally Aired: 07.16.99
Syndication Air Date: 10.23.00
Written by: Tor Alexander Valenza
Directed by: Peter DeLuise
Guest stars: Kevin McNulty (Dr. Warner), Eric Schneider (Dr. MacKenzie), Michael Shanks (Ma'chello)

Synopsis:
When Daniel goes insane, SG-1 must deal with Ma'chello's anti-Goa'uld technology only to get more members of the team infected.

Text by Zhuge Flea