Having successfully escaped the parasitic Goa'ulds, the SG-1 team returns to earth. Along for the ride is O'Neill's (
Richard Dean Anderson) new ally, the Jaffa Teal'c (Christopher Judge)--who, though he carries a larval Goa'uld in his belly, has renounced the parasites and their megalomaniac ruler Apophis. But O'Neill's superior officer Gen. Hammond (Don S. Davis) does not trust Teal'c and orders him to steer clear of SG-1. As it turns out, however, Teal'c may be the only one able to save O'Neill's comrade Kalwalsky (Jay Avocone), who has been infected by alien larvae--and who may have to be killed to prevent the larvae from passing through the Stargate. ~ Hal Erickson, All Movie Guide