I: imhotep, iratus bug, iris, isis...

[Vern]

Imhotep
Imhotep was a minor Goa'uld who is said to have built the pyramids on Earth, as landing platforms for Goa'uld ships. In the fifth season episode "The Warrior" he disguised himself as his own first prime Kytano. He amased an army of rebel Jaffa and had persuaded Teal'c, Bra'tac and Earth (the Tau'ri) to help him. Teal'c was sent on a suicide mission, and was captured by Yu. Yu spared his life and informed him that Kytano was working with the System Lords to hunt out the disloyal Jaffa.
Teal'c headed back and challenged Kytano for leadership (jomo'sequ). After finding out his true identity during the battle, Teal'c killed Imhotep.

Iratus Bug


Iris


Isis

[Chey]

Ironshirt - Unas from a different planet. Daniel took Chaka to trade with him, as they were mining Naquadah from the Una's sacred mines. Ironshirt agreed to mine the Naquadah for them, so they would not destroy the sacred caves.

[CaptainHaz]

Ishta

Leader of the Hak'tyl, close confidante of Teal'c and a formidable warrior.

[Hawkeye]

Iris


The "iris" is a large, metal protective device, similar to the leaf shutter of a camera, which was invented by Stargate Command to prevent unwanted travelers from emerging through the Stargate's wormhole.

When closed, the iris forms a barrier within 10 μm of the wormhole's event horizon, thereby preventing most forms of matter from properly reintegrating. Objects coming through the wormhole are destroyed instead, accompanied by a ringing thud against the iris. Radio signals are able to penetrate, however, allowing SG teams to request the opening of the iris using their GDOs.

[Vern]

In the Line of Duty (episode)
O'Neill and the SG-1 team are on a mission to Nasya, hoping to rescue the survivors of a planet that has been attacked by the Goa'uld.

Into the Fire (episode)
Trapped on Hathor's planet, Carter and Daniel can only watch helplessly as Hathor implants O'Neill with a Goa'uld symbiote.

Inauguration (episode)
Newly inaugurated Vice President Kinsey asks the president to put the Stargate program under his command.

Icon (episode)
SG-1's sudden appearance sparks a civil war on the planet Tegalus, whose inhabitants were unaware of the Stargate's true nature. A virtual reality training exercise goes dramatically wrong in Avatar when the simulation starts to learn from Teal'c trapping him and threatening his life.

It's Good To Be King (episode)
SG-1 must save a world once occupied by the Goa'uld when their former masters return to enslave them once again -- not knowing that their king is Earth's Harry Maybourne.