Bane (S02E10)

While exploring BP6-3Q1, Col. Jack O'Neill and the SG-1 team are attacked by giant insects. The team escapes through the stargate, but not before Teal'c is stung. When Teal'c returns to Earth, he begins to undergo a strange transformation as the insect virus mutates his DNA into something like its own. The change baffles Capt. Samantha Carter and geneticist Dr. Richard Harlow, and it terrifies Teal'c, who makes O'Neill promise he'll stop the transformation — by lethal means, if necessary. Unfortunately, Teal'c's condition intrigues Col. Maybourne, who sees the insect venom as a potential biological weapon. Maybourne uses his presidential mandate to take custody of Teal'c — who escapes while being transferred, leaving behind his Goa'uld larvae. Teal'c hides out on the mean streets of the city, where he is befriended by Ally, a young homeless girl. Meanwhile, O'Neill and the team return to BP6-3Q1 to capture one of the insects, for medical research into an antivenom. While there, they discover the insects' terrible power: They bypass normal breeding by genetically transforming their victims into their offspring. (Metro-Goldwyn-Mayer (MGM))