A visit from Jacob reveals the presence of a former system lord on Earth from the time of Ra. He has taken various guises over the millennia and currently is a leader of a Cult and as you would expect with the technology at his disposable he pulls off the disguise pretty well after all the System Lords are doing the same thing just on a bigger scale.
SG1 along with Jacob co-opt an ATF stake out and attempt to capture Seth while preventing the massacre that will occur if force is directly applied.
Seth is played by Robert Duncan and Jacob by Carmen Argenziano
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