In the Stargate science fiction universe, supergates or macrostargates (Goa'uld: Chappa'kol•


The supergate constructed by the Ori in the episode "Beachhead" was intended as a means to transport a fleet of starships from their home galaxy to the Milky Way. They sent the ring's components through a conventional Stargate, each component flying autonomously up into nearby space to self-assemble into the supergate's ring. The planet the original conventional Stargate was on was then enveloped in an energy shield that contracted to crush its mass into a micro black hole, which was thought to be intended as a means to hold the supergate's wormhole open for longer than the usual 38 minute time limit (a property of black holes that was previously seen in the episode "A Matter of Time").

This supergate device was destroyed by Vala Mal Doran before it was fully completed by inserting a Goa'uld Tel'tak cargo ship in place of the last link of the gate, causing it to suffer a catastrophic failure when an attempt to open the supergate was made.

In "Ripple Effect" the leftover black hole was used by SG-1 in an alternate reality as a means to travel between realities by directing a Stargate wormhole through it. Also revealed in "Ripple Effect" was an alternate reality in which the Ori successfully created a second Supergate and were swiftly conquering the Milky Way.

In the Season 9 episode "Crusade", Vala Mal Doran uses an Ancient communication device to inform the SGC that "somewhere out there, the Ori have a working Supergate". In the Stargate SG-1 season 9 finale, the Ori use their fully operational supergate to transport only four Ori battlecruisers which subsequently devastate the numerous vessels positioned to defend the Galaxy.Supergate activates•

In the Season 10 episode "The Pegasus Project", SG-1 manages to access the supergate from the Pegasus Galaxy through a gate that is then moved into the vicinity of a black hole, at least temporarily preventing the Ori from sending additional forces; due to the relative effects of the black hole, it shall take a great deal of time for the conventional 38-minute window to 'run down'. In the process, an Ori battlecruiser is destroyed by the giant vortex (the "kawoosh") of the activating supergate, while a Wraith hive ship is destroyed at the other end, scoring a triple victory against some of humanity's greatest foes.