Second
From The Stargate Omnipedia
Female humanoid Replicator, the second to emerge from the intelligence of the Replicators after they took over the Asgard planet Halla. Strong in her race's opinion of "lesser" beings, she was one of the first given the chance to enter the minds of SG-1 in the hopes of gaining information about the realms the team had explored in their home galaxy.
DETAILS
PLAYED BY - Kristina Copeland
FIRST APPEARED - Unnatural Selection
KEY EPISODE
Unnatural Selection - Second is one of the Replicator humanoids on Halla who corral SG-1 and enter their minds, searching for strategic information and breeding grounds for their brethren.