Ida is a home galaxy of the Asgard, and the location of the Asgard world Othala. The Replicators had become a plague in the Asgard home galaxy, overcoming many of the planets, until they were lured to the planet Hala and trapped in a time dilation field.

Cross Reference: Asgard, Hala, Othala, Replicators

Episode Reference: The Fifth Race, Small Victories