Seth

S3, E2: Capt. Samantha Carter's father Jacob enlists the SG-1 team in his hunt for the ancient Goa'uld system lord Seth whom he believes is hiding on Earth. A computer search reveals that Seth has maintained power on Earth for thousands of years by hiding behind false religions. The SG-1 team traces him to a heavily armed compound in Washington state. Outside the compound SG-1 clashes with a team of action-happy ATF (Bureau of Alcohol Tobacco and Firearms) agents led by the adversarial Special Agent James Hamner. They also meet Levinson a frantic father who's desperate to rescue his son Tom from Seth's cult. Col. Jack O'Neill Carter and Dr. Daniel Jackson break into the compound. Within minutes however they fall victim to the biological agent that Seth uses to brainwash his followers into doing his bidding.