The SG-1 team has just returned from a planet where it found a cylindrical artifact covered with ancient glyphs and writings. Jonas Quinn picks it up. The crystal rods inside start to glow. Scans show that the energy is harmless

When the device is shown to Gen. Hammond at Stargate Command, Jonas sees a bug-like alien about four or five feet long appear out of nowhere. Jonas draws his gun, and Col. O'Neill follows suit, but no one except Jonas sees the thing that, by now, has vanished into the wall. Gen. Hammond orders a lockdown and the base swept three times. They find nothing

The team and Hammond are now concerned that Jonas is suffering from the same sickness that some of the people on his planet got from overexposure to Naquadria, even though Dr. Fraiser had previously cleared him

The general orders downtime for everyone. O'Neill goes fishing while Teal'c, Maj. Carter and Jonas stay behind. Jonas and Carter use the time to tinker with the artifact

Carter has trouble discerning the type of particles the device emits, nor can she tell their purpose. Jonas takes a crack at deciphering the writings and glyphs on the device when a huge, glowing, centipede-like thing slithers out of it. Carter sees nothing. Jonas again visits Dr. Fraiser, who finds nothing physically or neurologically wrong with him

Then Teal'c also starts seeing the creatures, and soon the whole base is affected. The phenomenon spreads beyond Stargate Command: O'Neill sees one at a gas station and blasts the poor owner's sign trying to kill what isn't really there

Carter and Jonas soon discover that these things are very real, but living in another dimension that the device somehow allows them to see. Although these creatures have no physical contact with humans and seem to pose no threat, the mere sight of them could cause major panic were this phenomenon to reach the general public

Stargate Command tries everything to stop the device from emitting its energy particles. They even take it back to the planet through the stargate, hoping that returning it to its resting place will stop the effect. When that plan fails, the device is brought back to Stargate Command, where Jonas struggles with the problem again

It finally occurs to Jonas that the energy this artifact is sending out has nothing to do with these creatures entering our dimension. This "second sight" is passed on by touch, like a contagion. Jonas had touched it first. Then he brushed against Teal'c, and so on

Gen. Hammond orders the immediate containment of Colorado Springs and the isolation of anyone who could have come into contact with Stargate personnel. But it is too late: O'Neill has had contact with the gas-station owner, who has contact with hundreds of motorists a day. People on the outside are in a state of panic

O'Neill works with the containment team to find the gas-station owner and anyone else who contracted this contagion. Meanwhile, Carter and Jonas work on reconfiguring the crystal rods inside the device in an attempt to reverse the polarity of the energy. At last they find the right combination. Jonas touches the device and the creatures vanish from his sight. He touches Carter and she stops seeing the creatures as well. The cure is then spread to everyone on the base. Stargate Command is clear

Stargate personnel are dispatched to shake hands with and cure Col. O'Neill and the containment team, who in turn are able to cure everyone affected

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