"I've read about devices like this. They were known in our vernacular as Stargate Destroyers; a last resort, break-glass-in-case-of-emergency weapon of mass destruction. The Ancients created them for the purpose of obliterating the stargate on another planet if the world in question became overrun by an unstoppable enemy" ― (SG1: Redemption, Part 2 (Cut dialogue))

Stargate destroyers are powerful devices built by the Ancients that are capable of completely destroying a Stargate on one planet via another Stargate on another planet. They work by transmitting large amounts of energy through one Stargate to another, causing the gate on the other side to overload and explode from absorbing more energy than it can contain.


Stargate destroyer 2

The shield preventing Teal'c and Master Bra'tac from entering the weapon.

The Stargate destroyer functions by projecting a high-intensity energy beam into the event horizon of an active, outgoing Stargate. The energy is transmitted through the wormhole to the other side. Rather than reintegrating on the receiving end, however, the energy is absorbed into the gate. As time passes, energy continues to build up in the naquadah of the receiving gate. Because of the large amounts of energy being fed into the gate, it is able to bypass the 38-minute limit that disconnects ordinary wormholes. Eventually, the energy buildup exceeds the capacity of the naquadah in the gate, causing it to explode with the force of a two to three thousand megaton bomb, enough to cause a disastrous effect on the environment that would wipe out all life on a planet the size of Earth.

The device consists of a large, two-pronged emitter positioned in front of the Stargate, from which the energy beam is generated. A tube or conduit extends from the emitter into the ground, indicating that part of the device is buried (as indicated by the collapse of the area around the emitter followed by a large underground explosion seconds after the emitter itself was destroyed). The emitter is surrounded by a ring of smaller obelisks connected by a separate energy beam, which can be seen to spin at a steady rate. The obelisks generate a forcefield preventing entry through the open areas; however, a single unshielded doorway, being two halves of a small obelisk, allows access to the device. The forcefield does not completely cover the device, only blocking ground access.

The devices origins are not made clear during the episodes it appears in nor why the Ancients would intentionally design such a device, though it was theorized that Anubis may simply have repurposed it to suit his needs, that the stargate destroyers were originally used by the Ancients to recharge the energy source of DHDs or that they had been constructed to bypass the 38 minute wormhole limit but abandoned because of the consequence of extended use similar to the Attero Device.


Stargate destroyer 1

The doorway through which Anubis's Jaffa entered and exited the device.

Anubis managed to locate the last operational device and used it in an attempt to destroy the Tau'ri. Earth was powerless to stop it, and had no means of reaching their offworld allies for assistance. Rodney McKay suggested using an Electromagnetic Pulse Generator to disable the device, but this failed to stop it.

Inspired by Jonas Quinn, Major Samantha Carter came up with the idea to fly the gate offworld using the X-302 hyperspace fighter. Using its hyperspace generator, the gate was flown to a safe distance and detonated harmlessly in space. Meanwhile, Rya'c, piloting a stolen Death Glider, was able to destroy the device. It is unknown if any attempts were made by Anubis to rebuild it, but is unlikely. (SG1: "Redemption, Part 1", "Redemption, Part 2")

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