02E07 - Message in a Bottle

On a mission SG-1 finds an ancient, apparently lifeless metallic sphere-shaped object and brings it home to study the minute, elaborate writing on it, hoping they can then open it. Jack was eager to get away from the tedious examination, which seemed to be going nowhere, on yet another planetary mission, when the sphere suddenly 'warms up' and surprises everyone by sprouting long spikes in various directions, one of which happens to go straight trough Jack's body which soon infects. A staff-weapon doesn't even affect it, Sam fears it is only being fed energy. The fast-spreading infectious organism causes necrosis even on dead material, such as Jack's uniform and, worse, the computer system; yet it is slowed down by an antibiotic, tetracycline; UV-light shows it even got trough the walls, sneakily infecting everyone, starting with young control chamber Lieutenant Graham Simmons, who is allergic to the tetracycline (and clearly has a timid crush on Carter), only Teal'c is protected by his symbiont. When a blow-torch is about to sever the spike trough Jack, the sphere suddenly sprouts length shifting trough him. Carter suggests limiting the oxygen supply which the organism needs, but auto-destruct kicks in with a 3 hours count-down, and can no longer be overrode because of the damage to the computers. Then Daniel notices a symbol in the gibberish it causes on the computer screens, and believes the sphere is trying to communicate: is it really an aggressor? Sam agrees to try making contact by stopping Jack's medication, he agrees. Indeed this rapidly turns him into the conscious medium of an ancient, otherwise dormant race, which is eager to spread and consume earth, but is now offered an alternative planet to consider...