The Russians send a distress call to the SGC when an Asgard Stargate, recovered from the ocean floor, begins wreaking havoc, creating a perpetual wormhole. The SG-1 crew teams with Soviet scientist Dr. Svetlan Markov (Marina Sirtis) to neutralize the Stargate, which has been locked into a water-covered planet. Along the way, O'Neill (Richard Dean Anderson) is unexpectedly reunited with the traitorous Col. Maybourne (Tom McBeath). ~ Hal Erickson, All Movie Guide