Stargate Infinity Episode 18 - The Key Episode Title:The Key.Episode Description:The society of the Commonality banned all writing, having considered it an outdated method of communication—only symbols and video are permitted. Ec'co's calculations prove that a comet is about to hit the Commonality's planet, but because the Commonality has no means to verify this warning, they choose to disregard it. Will the Commonality resistance movement be able to help?