With the help of teenager mathematics prodigy Eli Wallace (David Blue), Dr. Nicholas Rush (Robert Carlyle) discovers what he believes is the secret to intergalactic travel using the Stargate's heretofore unlocked ninth chevron. However, when the base where the Stargate is kept comes under attack, Rush insists on using the Stargate to evacuate, disregarding the orders of commanding officer Colonel Everett Young (Louis Ferreira). Lt. Matthew Scott (Brian J. Smith) is the first officer through the wormhole, leading the military and civilian survivors through before the base is destroyed.